Question Problem with Unity 2D mobile not refreshing screen after every frame

I seem to have this problem where Unity 2D on a mobile device won't update / clear the screen after frame. This leads to all the sprites to paint over the background when ever their position is updated.

Note: This only happens when running on an actual mobile device. When in play mode in the Unity editor everything works fine.

Some information that might help - I've been experimenting with lighting and bloom effects by creating a specialised shader. I'm also using an addon to use .svg files as sprites. Although I don't know if this would effect it or not

 

Either put a camera in the scene or else put a full-screen anchored Image at the far back of your entire UI.

 

A camera is included in my scene by default. When you say "put an image at the far back" do you mean change the z axis? Also could you let me know you thought process behind that, I'm not why that would change anything.

Thanks