I have a hot tag that appeared at install that persists. The tag is “bbPress” and shares the first line of the Hot Tags with the “legitimate” first tag. There are no documents with this tag and recount has been performed with all options checked. Where is this coming from?
If you deleted the topic that was tagged with bbPress (it’s the default first post/first topic I believe) then you just need to recount. There is an option there something like “Delete tags with no topics.” If you go through the recount, just check them all and the phantom tag should go away.