As reported in this thread:
https://community.metabrainz.org/t/artist-origins-map-stuck/716501/1
The "Artist Origins" map is stuck/has stopped updating, by the looks of it since September.

Interestingly, I think mine are okay (it is easy to compare the top artists lists with the map for each time range, on the Stats page), except for "Last Week" which is outdated/showing artists not in the lists:
https://listenbrainz.org/user/aerozol/stats/?range=week

The forum thread reporter's maps are more consistently outdated:
https://listenbrainz.org/user/Firepal3D/stats/?range=month