You should have had a reply by now... sorry.
No, I have never seen anything like this before, these are all themes, obviously, all the same build numbers. Is it possible that the themes for v3.0 are using the more sophisticated bootstrap base and earlier themes are either redundant or no longer workable? I wouldn't have thought so, but anything is possible. I would upgrade my test site before my production site, so if that is what you are doing, delete the themes mentioned and continue with the upgrade. See what happens to your test site first.