Or, why is my Meta reputation being accounted for so ... weirdly? Did something break?
Your meta reputation is derived from the parent site, i.e., Super User
What is reputation?
You must have at least 5 reputation on the parent website to participate on Super User Meta.
Reputation here is entirely derived from the parent website; your reputation is the same as your reputation on the parent website, synchronized hourly. Votes here do not affect your reputation in any way. However, you can earn unique badges here on the meta site.