six months later and it still happens. is there a fix somewhere in the comments someone made or no? (i extracted the zip file and tried running it but no luck)
Since I can't recreate the issue on my computer it's difficult for me to come up with a fix, it could be anything from a graphics issue like the resolution or vsync issues other people have had to something else entirely. I would suggest looking for similar issues on the godot forum, but it's also entirely possible I messed something up that makes it incompatible with some computers.