Have you tried looking at any other screen to see if it shows there? I mean even making your background plain black and see if you see the issue there or not. Seeing only in a specific program wouldn't give enough info.
That does not show up in games? Everything runs fine without crashing? Those image issues should be coming from some issue with the video card normally but then it would be showing up during the actual games not just the menus to the launchers.
For me, if those where the only spots this showed up, I would just leave it as it is. Messing with trying to fix it may end up making something else worse and having a visual issue in only a few specific places is not much to deal with.
Overheating, RAM issues or bad video card. Video card would depend if your system has a secondary higher power card, but the onboard video can have issues also, it's just more rare to see that. RAM can cause this since onboard video uses shared memory with the system so if RAM is acting up, video can as well.