Default [Q] Youtube app issue

The clichés of asking for help in a forum as your first post. Oh joy. Either way, this isn't a huge problem for me, but if anyone knows how to fix it, I would be ecstatic.

When in in youtube full screen, it is exactly that, full screen, but, seemingly randomly, I get my notification bar that appears on screen along with the home buttons, and until I force close the app, they won't go away and take up screen space during a video. Any fix for this or am I missing something as to why it's happening?

Attached pictures show immersive and what happens after.

Phone is stock LG g2.
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