[chrishajer]

Can you post a link to your forum where someone can see the problem?

Are you using any plugins that might cause this?

Maybe there’s a problem with your theme?

How about AJAX and JavaScript? I think tag removal depends on JavaScript.

I’m not sure if deleting a topic deletes the tags with it. I tend to think it doesn’t since there is an admin option to recount and find tags with no topics (stranded tags.) Also, bbPress would have to be smart enough to know if a tag was used only on that topic and no others. Maybe it’s that smart but I am guessing it doesn’t work like that.