I'm seeing an intermittent display problem, both in Win10 and macOS. It seems to have cropped up since the introduction of the "thumb size slider" in the Explore window.
If you've got it set to display anything other than file name, and there are multiple rows of thumbnails, hovering (so that you see, for example "Add comment...") sometimes causes the rows of thumbnails below the current row to shift downward slightly, especially in Win10. In macOS, it's more likely to cause the thumbnails to the right of the current thumbnail to shift to the right a bit.
It seems to happen if you have some long-ish file names - not necessarily long enough to line-wrap, but longer than really short names like mydog.jpg. And changing the thumbnail size slider position changes the effect - sometimes it goes away.
Finally found a usable screen video recorder. In this project, I'm displaying comments, but these images have no comments. The twitchiness seems to depend upon how long the file names are, but I can't quite pin it down.