I've not seen this in any of my tests on Windows Phone. The type of corruption your screenshots show strongly indicate a graphics driver problem. It is not normally possible for our own code to result in that level of glitching.
Are you sure the phone is fully up to date? Microsoft have released several updates recently.
We cannot investigate this further without a .capx. If you not are allowed to share yours, please make a new one from scratch which you can share and demonstrates the problem. We prefer this anyway, as our bug report guidelines outline we do not normally accept full projects in bug reports.