Looking at the modlog, the ones you removed were posts (microblogs). Relevant to the issue?
Nice catch!
With your direct links, I was able to see those threads. I attempted to delete two of them, and the modlog shows that I was successful. I've left the third for now as evidence for any developers who care to look.
Regarding "unban", I'm hoping that's just a bug in how things are printed. The ban does show up in the moderation log.