I have found out that it was a third party program that I installed a while ago called System Explorer. Disabling that fixed it.
I have been having this problem for some time and I have no idea whether it's something to do with my monitor itself or with a program on the PC. Whenever I hover on the top right of the screen I get a box pop up:
It's really annoying when I play an FPS game for example and it suddenly pops up. Does anyone have an idea what is causing this or how to remove it?
Thanks in advance,