I had noticed some of these things too! I know when I asked about it (looks like it was just over a year ago at this point - link here), I learned that apparently the origin categories can’t be edited? Which I know there are some parts of the site that are stuck for some reason (like the pop culture sections, I think), which is unfortunate but might be the reality.
I completely agree on the Eastern European names, too! I hadn’t noticed that when I was going through the various origins. I think a similar thing has happened with a lot of Indigenous and African names, where they’ve been coded only under the broad umbrella rather than their specific culture of origin and that’s why so many Indigenous and African origin categories come back blank (Hopi, Mashona, Miwok, Mwera, Omaha, Osage, Seminole, etc)