Good that u brought the issue, it's android's buttons, I forgot the right term. When I switched from tablet to my new phone, I had a lot issue with this for really long time, and then got used to it, still wish it will get fixed.

The problem is, pl ain't getting full 'full screen' mode, some devices don't have physical home buttons, I think the problem arises for those devices, YA IT'S ANNOYING, PLEASE MAKE PL FULLSCREEN FOR ALL DEVICES.