onsingletapup from osmdroid calls multiple items

Question

I've created an Osmdroid map with makers, but some markers are very close, so when i tap on it, there a lot of "onSingleTapUp called", it's like i'm clicking on all of them in the same time, and i don't see why, even when i can cleary see a blank between two overlay items the listener listen both taps.

        addOverlayItems();
        MyItemizedOverlay itemizedOverlay = new MyItemizedOverlay(context, items, gestureListener);
        map.getOverlays().add(itemizedOverlay);

        private void addOverlayItems(){
        for(int i = 0; i < sparetimes.size(); i++){
        SpareTimeObject sparetime = sparetimes.get(i);
        String title = sparetime.getLeisureTitle();
        String description = sparetime.getLeisureDescription();
        if(title == null){
            title = "Titre a definir";
        }
        if(description == null){
            description = "Description a definir";
        }
        if(sparetime.getLeisureLatitude() != null && sparetime.getLeisureLongitude() != null){
            double lat = Double.parseDouble(sparetime.getLeisureLatitude());
            double lon = Double.parseDouble(sparetime.getLeisureLongitude());
            GeoPoint geoPoint = new GeoPoint(lat, lon);
            MyOverlayItem item = new MyOverlayItem(title, description, geoPoint);

            items.add(item);
        }else{
            Log.i(TAG, "aucune localisation");
        }

    }
}
ItemizedIconOverlay.OnItemGestureListener<MyOverlayItem> gestureListener = new OnItemGestureListener<MyOverlayItem>() {

    @Override
    public boolean onItemLongPress(int arg0, MyOverlayItem arg1) {
        Log.i("onItemLongPress", ""+items.get(arg0).getTitle());
        return false;
    }

    @Override
    public boolean onItemSingleTapUp(int arg0, MyOverlayItem arg1) {
        Log.i("onItemSingleTapUp", ""+arg1.getTitle());
        Intent intent = new Intent(context, SpareTimeCardActivity.class);
        addToIntent(intent, sparetimes.get(arg0));
        context.startActivity(intent);
        return false;
    }

};