Why is there 2 white squares?

[Crispy_treezzz]

Why is there 2 white squares that have appeared on my samsung a9+ tablet. I have restarted and updated it but nothing has fixed it. I just got this tablet have not dropped it or damaged it in anyway or form. 

[Tidbitty]

Try changing wallpaper?

[Leavy]

It might be how the wall paper is. At least from how it seem like when I got my a9 plus. I changed the wall paper and didn't see it anymore