image moved is leaving a trail

hi everyone i have a menu on the iphone where the menu can be moved left or right and it works fine the only problem is when it is built i am seeing a trail left behind and does not go away until the ui is hidden any ideas on how to fix this

ive tried a few things, but builds take so long its taking ages to guess

Like @holymcroly, I think that this might be related to the camera clear flags that is used to render the GUI.

Don’t clear and depth only can cause this kind of thing if no other camera are used in the scene. If it is the case, consider using a background color to clear the camera.

What clear flags are set on the camera that draws your HUD? Also, is there a chance a trail renderer is attached to your menu?