Openlayers 3 draws over other icons

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I am using Openlayers 3. I made an html file witch opens map of a cuntry in offline mode and allows user to draw images/segments and polygons on it. My problem is when i change the image i want to insert on the map it also draws over other points on the map and i dont understand why , any ideas ???



Geometry type Point LineString Polygon Stop Sign Argentina



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