Black Squares on certain parts of a GUI

Hello, Developers! Recently, I’ve ran into a bug that is currently occurring for certain players playing on mobile devices such as an Ipad. I’ve tried to look into this bug myself, however, I can’t seem to find out why this happens but it’s affecting our currently player count.

If anyone has ever seen this bug and knows what it’s about or whats affecting it, please do enlighten me as I cannot find any answers as of right now.

Example of the bug: