That is wild! This is definitely the first time I've seen this or anything like this happen... even weirder that it resolved itself after some fiddling! Thanks for getting a screenshot, I'll certainly keep an eye out for this elusive bug...
I'm glad that you made it to the end of the game, and hopefully this bug didn't sour your experience too much. Thank you for playing and taking the time to report the bug, it means a lot to me!