We researched the issue and it seems that the usage of Qt Graphical Effects mess with the rendering on some Android devices (especially Samsung).
The next minor update already includes a few improvements in that area, so hopefully it works a bit better.
The update is planned for today. It should work for most of the views.
We are currently trying to find out which used effects, or in which combination with Felgo cause the issue. If possible, we try to fix it in our framework.
In case the the issue is a general problem by Qt and we can’t get some effects to work without causing troubles, we will have to file a Qt bug report and hope they fix it on their end. In the meantime, a possible solution would then be to not use these effects at all – we could provide a setting to disable the effects in that case.