Random/Rare graphical glitch. Start-up screen, Menu screen.

I'm doing this on my computer so i don't have any images, It's very random but when ever i start up minecraft on my phone it shows a weird monotone like version of the regular start up screen the minecraft logo has a black rectangle behind it and the background is a very light grey but as it goes down it gets darker like a gradient. The menu screens background is the same gradient, the logo has the black rectangle but the buttons are solid grey rectangles the spot on the screen where my avatar/character is supposed to be is just a black rectangle. I don't know why. Don't know how. Not really bothering me. Just telling ya!