Problem displaying in Android Device

i saw this problem in just main menu scene after i run on my android device.
Is there any way to solve this problem?

I solved this problem so that:
i change camera/ Clear Flags from: “don’t clear” to “solid color”.
With this change the following warning option was fixed:

*Tiled GPU perf. warning: RenderTexture color surface  (321x514) was not cleared/discarded, doing <run with profiler for info>*