Background shines through on Android

Hi i am testing an App on two handys, on one it works fine, but on the samsung galaxy s4 mini some strange bars appear on one(after some time on all) of my canvas. I will attach a screenshot of my unityeditor history and a screenshot of the handy! Please say what additional Information you need.

Should i report this as a bug? I provided a downloadlink to the project in the comments. EDIT:Upgrading from 5.0 to 5.1 fixed it for some time but it just reapeared.