Why would layers disappear when dragging a layer underneath them? Here's the scenario: I have a base image which you can drag and pinch/zoom. On click I add little circles (new layers created in the code) at the point of the click. This works fine. When I drag the base image, the circles move with it as expected, but sometimes they disappear. If I click a new spot (creating a new circle) all of them come back. Same behavior happens when I pinch/zoom the base image.