It's not me who has this problem but a friend of mine, he's Russian and has a hard time speaking English so I decided to help him but idk how to solve this problem... (rip)

We did a skype screen sharing thing and what I saw was some weird behavior on his screen.
https://gyazo.com/a38f1851b514a76d98ff9ed57131944d
the problem:
https://gyazo.com/db0fd191d3a3490cb64a9484c77f5b12

That same window keeps spamming on the screen of sfm itself. Everytime he moved his screen , the window appeared and then goes away and then appears again.
Does anyone know why this happens?

Anyway, thanks in advance!