Thanks @a_5mith, let us know. The tags one definitely sounds like a new bug though.
gh#1947julianlam created this issue in NodeBB/NodeBB closed Topics with tags with an ampersand in it are not found in the tags page #1947
Category 1 had 17 topics and I 16 were deleted.
In home page you can still see total count 17.
Delete doesn't actually delete the topics, at the minute, NodeBB will only soft delete a topic. This was how it was originally designed, however, you can follow the progress on hard deleting topics here:
thanks @a_5mith I think you know more about NodeBB issues than I do at this point