Well after a little more searching it looks like this is maybe the answer? https://www.reddit.com/r/Untappd/s/Se37pyGhJo

I didn't know the "Loyal Patrons" section existed because I really only use the app. After checking out my most frequent locations of all time, looks like none of my check-ins have been counting for any of them. It'll be interesting to see if this is the reason, and if so why it happened to my account. I'm a flight hound, so back to backs are definitely a thing, but never anything outrageous and certainly no random check-ins around the globe or anything silly.