Yeah I've known about this since I first implemented exit tags years ago, and it's been on my list of things to look into, but it's hard to solve given the architecture (and not very important compared to all the other priorities
) so I haven't done anything about it yet. It's due to labels for off-screen exits showing simultaneously with on-screen exits, even for the same exit which happens to be on the border.
I don't plan on doing anything about this in the near term since it's just an occasional cosmetic thing.