About the tagging: I think Gloomhaven's tag started to include Thematic around 30% of tags. It didn't have that tag in the beginning. Not sure it is done manually.
But the different number of fake votes makes sense. I initially assumed that there was just one ranking and then sorting depending on tag.
Mmm yeah to be honest I have no clue how a game becomes eligible for certain sub categories. Tagging may have something to do with it.