Hi for a bit there have been duplicates of “fediverse”, “gaming”, “science” and “technology” in the list of topics under the explore menu.

Here’s a screenshot:
riPQck1OdS6Zxd1.png

According to old.piefed.zip the old (duplicates that have lower amounts of communities and no sub-topics) have IDs: /topic/6 (fediverse), /topic/1 (gaming), /topic/9 (science), /topic/3 (technology)