[Google Maps] Polylines bug affichage ?

Bonjour,
Pour mon application je souhaite afficher les trajets effectués par un véhicule.
Je récupère des liste coordonnées en JSON et créer mon objet polyline.
Dans le cas ou je récupère 1 ou 2 trajet(s), tout va bien ;le problème est lorsque je récupère 3 trajets et plus, certains Marker Arrivée ou Départ se rejoignent alors qu'il n'ont aucun rapport l'un par rapport à l'autre.
Je n'ai pas d'erreur JS ou autre, mais l'affichage est un peu incohérent.

Voici le code de ma fonction de création de mes Polyline:

Code:

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$.fn.displayTrip = function(map){
    var listTrips = $('[data-trips]').data('trips');
    $(listTrips).each(function(i, trip){
	var tripPath = [];
	var tripsCoordinates = [];
        $('#map_canvas').gmap('addMarker',{position:new google.maps.LatLng(trip.startpath.lat,trip.startpath.lng),icon:trip.startpath.icon});
        $('#map_canvas').gmap('addMarker',{position:new google.maps.LatLng(trip.endpath.lat,trip.endpath.lng),icon:trip.endpath.icon});
        var color = "#0000FF";
	for(var j=0 ;j < trip.steps.length; j++){tripsCoordinates.push(new google.maps.LatLng(trip.steps[j].lat, trip.steps[j].lng));}
	tripPath = new google.maps.Polyline({path:tripsCoordinates,strokeColor:"#0000FF",strokeOpacity:1,strokeWeight:2});
	tripPath.setMap(map);
    });
    map.setZoom(15);
}

Et voici le type de données que je récupère :

Code:

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[{"startpath":{"lat":48.827915,"lng":2.24139,"icon":"depart.png"},"steps":[{"lat":48.827915,"lng":2.24139,"date":"2013-02-05T07:23:16+01:00"},{"lat":48.827933,"lng":2.24134,"date":"2013-02-05T07:24:02+01:00"},{"lat":48.830055,"lng":2.239195,"date":"2013-02-05T07:37:21+01:00"},{"lat":48.829532,"lng":2.23682,"date":"2013-02-05T07:39:33+01:00"},{"lat":48.829523,"lng":2.236167,"date":"2013-02-05T07:39:46+01:00"},{"lat":48.830495,"lng":2.235375,"date":"2013-02-05T07:41:15+01:00"},{"lat":48.83061,"lng":2.234842,"date":"2013-02-05T07:42:05+01:00"},{"lat":48.830935,"lng":2.235247,"date":"2013-02-05T07:43:14+01:00"},{"lat":48.831777,"lng":2.237727,"date":"2013-02-05T07:43:40+01:00"},{"lat":48.832715,"lng":2.240175,"date":"2013-02-05T07:44:27+01:00"},{"lat":48.833473,"lng":2.242632,"date":"2013-02-05T07:45:04+01:00"},{"lat":48.83428,"lng":2.245087,"date":"2013-02-05T07:45:22+01:00"},{"lat":48.835128,"lng":2.248017,"date":"2013-02-05T07:46:07+01:00"},{"lat":48.835548,"lng":2.249442,"date":"2013-02-05T07:47:38+01:00"},{"lat":48.835872,"lng":2.249708,"date":"2013-02-05T07:47:48+01:00"},{"lat":48.836882,"lng":2.252012,"date":"2013-02-05T07:48:07+01:00"},{"lat":48.837252,"lng":2.251827,"date":"2013-02-05T07:48:20+01:00"},{"lat":48.837975,"lng":2.251322,"date":"2013-02-05T07:48:37+01:00"},{"lat":48.838198,"lng":2.252132,"date":"2013-02-05T07:49:45+01:00"},{"lat":48.83815,"lng":2.25242,"date":"2013-02-05T07:50:14+01:00"},{"lat":48.843303,"lng":2.256508,"date":"2013-02-05T09:30:04+01:00"},{"lat":48.844948,"lng":2.257422,"date":"2013-02-05T09:30:31+01:00"},{"lat":48.845348,"lng":2.25782,"date":"2013-02-05T09:30:41+01:00"},{"lat":48.845433,"lng":2.258662,"date":"2013-02-05T09:31:20+01:00"},{"lat":48.84712,"lng":2.259252,"date":"2013-02-05T09:31:41+01:00"},{"lat":48.847972,"lng":2.259945,"date":"2013-02-05T09:32:25+01:00"},{"lat":48.848078,"lng":2.262603,"date":"2013-02-05T09:33:17+01:00"},{"lat":48.848497,"lng":2.26521,"date":"2013-02-05T09:34:31+01:00"},{"lat":48.8499,"lng":2.266798,"date":"2013-02-05T09:35:24+01:00"},{"lat":48.850215,"lng":2.267008,"date":"2013-02-05T09:35:29+01:00"},{"lat":48.829895,"lng":2.260357,"date":"2013-02-05T11:35:53+01:00"},{"lat":48.829267,"lng":2.262798,"date":"2013-02-05T11:36:40+01:00"},{"lat":48.82848,"lng":2.265388,"date":"2013-02-05T11:37:25+01:00"},{"lat":48.827758,"lng":2.267885,"date":"2013-02-05T11:38:00+01:00"}],"endpath":{"lat":48.827933,"lng":2.24134,"icon":"arrivee.png"}},{"startpath":{"lat":48.827843,"lng":2.24138,"icon":"depart.png"},"steps":[{"lat":48.827843,"lng":2.24138,"date":"2013-02-05T07:35:06+01:00"},{"lat":48.829443,"lng":2.239948,"date":"2013-02-05T07:37:06+01:00"},{"lat":48.830055,"lng":2.239195,"date":"2013-02-05T07:37:21+01:00"},{"lat":48.829532,"lng":2.23682,"date":"2013-02-05T07:39:33+01:00"},{"lat":48.829523,"lng":2.236167,"date":"2013-02-05T07:39:46+01:00"},{"lat":48.830495,"lng":2.235375,"date":"2013-02-05T07:41:15+01:00"},{"lat":48.83061,"lng":2.234842,"date":"2013-02-05T07:42:05+01:00"},{"lat":48.830935,"lng":2.235247,"date":"2013-02-05T07:43:14+01:00"},{"lat":48.831777,"lng":2.237727,"date":"2013-02-05T07:43:40+01:00"},{"lat":48.832715,"lng":2.240175,"date":"2013-02-05T07:44:27+01:00"},{"lat":48.833473,"lng":2.242632,"date":"2013-02-05T07:45:04+01:00"},{"lat":48.83428,"lng":2.245087,"date":"2013-02-05T07:45:22+01:00"},{"lat":48.835128,"lng":2.248017,"date":"2013-02-05T07:46:07+01:00"},{"lat":48.835548,"lng":2.249442,"date":"2013-02-05T07:47:38+01:00"},{"lat":48.835872,"lng":2.249708,"date":"2013-02-05T07:47:48+01:00"},{"lat":48.836882,"lng":2.252012,"date":"2013-02-05T07:48:07+01:00"},{"lat":48.837252,"lng":2.251827,"date":"2013-02-05T07:48:20+01:00"},{"lat":48.837975,"lng":2.251322,"date":"2013-02-05T07:48:37+01:00"},{"lat":48.838198,"lng":2.252132,"date":"2013-02-05T07:49:45+01:00"},{"lat":48.83815,"lng":2.25242,"date":"2013-02-05T07:50:14+01:00"},{"lat":48.843303,"lng":2.256508,"date":"2013-02-05T09:30:04+01:00"},{"lat":48.844948,"lng":2.257422,"date":"2013-02-05T09:30:31+01:00"},{"lat":48.845348,"lng":2.25782,"date":"2013-02-05T09:30:41+01:00"},{"lat":48.845433,"lng":2.258662,"date":"2013-02-05T09:31:20+01:00"},{"lat":48.84712,"lng":2.259252,"date":"2013-02-05T09:31:41+01:00"},{"lat":48.847972,"lng":2.259945,"date":"2013-02-05T09:32:25+01:00"},{"lat":48.848078,"lng":2.262603,"date":"2013-02-05T09:33:17+01:00"},{"lat":48.848497,"lng":2.26521,"date":"2013-02-05T09:34:31+01:00"},{"lat":48.8499,"lng":2.266798,"date":"2013-02-05T09:35:24+01:00"},{"lat":48.850215,"lng":2.267008,"date":"2013-02-05T09:35:29+01:00"},{"lat":48.829895,"lng":2.260357,"date":"2013-02-05T11:35:53+01:00"},{"lat":48.829267,"lng":2.262798,"date":"2013-02-05T11:36:40+01:00"},{"lat":48.82848,"lng":2.265388,"date":"2013-02-05T11:37:25+01:00"},{"lat":48.827758,"lng":2.267885,"date":"2013-02-05T11:38:00+01:00"}],"endpath":{"lat":48.83815,"lng":2.25242,"icon":"arrivee.png"}},{"startpath":{"lat":48.838215,"lng":2.252155,"icon":"depart.png"},"steps":[{"lat":48.838215,"lng":2.252155,"date":"2013-02-05T07:56:26+01:00"},{"lat":48.837805,"lng":2.252713,"date":"2013-02-05T07:56:53+01:00"},{"lat":48.836195,"lng":2.254162,"date":"2013-02-05T07:58:25+01:00"},{"lat":48.834542,"lng":2.255567,"date":"2013-02-05T07:59:21+01:00"},{"lat":48.833933,"lng":2.255925,"date":"2013-02-05T07:59:31+01:00"},{"lat":48.833482,"lng":2.25547,"date":"2013-02-05T07:59:42+01:00"},{"lat":48.83217,"lng":2.257302,"date":"2013-02-05T08:00:20+01:00"},{"lat":48.831708,"lng":2.258242,"date":"2013-02-05T08:00:59+01:00"},{"lat":48.831123,"lng":2.257385,"date":"2013-02-05T08:01:37+01:00"},{"lat":48.830188,"lng":2.259738,"date":"2013-02-05T08:03:18+01:00"},{"lat":48.829423,"lng":2.26222,"date":"2013-02-05T08:06:25+01:00"},{"lat":48.828807,"lng":2.264782,"date":"2013-02-05T08:07:31+01:00"},{"lat":48.827923,"lng":2.267165,"date":"2013-02-05T08:07:52+01:00"},{"lat":48.827773,"lng":2.271105,"date":"2013-02-05T08:08:26+01:00"},{"lat":48.82741,"lng":2.271362,"date":"2013-02-05T08:08:40+01:00"},{"lat":48.835643,"lng":2.255703,"date":"2013-02-05T09:27:14+01:00"},{"lat":48.83739,"lng":2.256838,"date":"2013-02-05T09:28:23+01:00"},{"lat":48.83797,"lng":2.25748,"date":"2013-02-05T09:28:35+01:00"},{"lat":48.839842,"lng":2.256398,"date":"2013-02-05T09:29:13+01:00"},{"lat":48.841565,"lng":2.256075,"date":"2013-02-05T09:29:47+01:00"},{"lat":48.843303,"lng":2.256508,"date":"2013-02-05T09:30:04+01:00"},{"lat":48.844948,"lng":2.257422,"date":"2013-02-05T09:30:31+01:00"},{"lat":48.845348,"lng":2.25782,"date":"2013-02-05T09:30:41+01:00"},{"lat":48.845433,"lng":2.258662,"date":"2013-02-05T09:31:20+01:00"},{"lat":48.84712,"lng":2.259252,"date":"2013-02-05T09:31:41+01:00"},{"lat":48.847972,"lng":2.259945,"date":"2013-02-05T09:32:25+01:00"},{"lat":48.848078,"lng":2.262603,"date":"2013-02-05T09:33:17+01:00"},{"lat":48.848497,"lng":2.26521,"date":"2013-02-05T09:34:31+01:00"},{"lat":48.8499,"lng":2.266798,"date":"2013-02-05T09:35:24+01:00"},{"lat":48.850215,"lng":2.267008,"date":"2013-02-05T09:35:29+01:00"},{"lat":48.829895,"lng":2.260357,"date":"2013-02-05T11:35:53+01:00"},{"lat":48.829267,"lng":2.262798,"date":"2013-02-05T11:36:40+01:00"},{"lat":48.82848,"lng":2.265388,"date":"2013-02-05T11:37:25+01:00"},{"lat":48.827758,"lng":2.267885,"date":"2013-02-05T11:38:00+01:00"}],"endpath":{"lat":48.82741,"lng":2.271362,"icon":"arrivee.png"}}

Merci d'avance.
Mugette.