Same profile pic in 2 users - Monterey

I am not seeing the same update to my iCloud photo. I have multiple Mac & iOS devices (phone, iPad, TV x 2, MacBook, iMac) and am not seeing the photo harmonize across all devices. The only devices which don't seem to harmonize to the same iCloud photo are my MacBook Air (running Monterey). My old iMac harmonizes to the same iCloud photo. There seems to be 2 issues - harmonization of the iCloud photo and the overwriting of other users on the MacBook Air running Monterey. I have already deleted and added back the secondary user only to see the issue still occur. Thanks for your thoughts and assistance.

Tried it. Same thing happens under both scenarios. It's perhaps worth noting that the changes made on the MacBook Air are not propagating to my other devices via iCloud. Changes to my iCloud photo made on my iOS device are propagated onto other iOS and TV devices but not the Air.

Thanks for your continued support! Changing the photo on the MBA via System Preferences seems to have propagated to the secondary account. I also signed out (changed password) on the primary account and got the same result. I am not seeing any associated references to the two accounts but they are linked via Family Sharing. The secondary (kids) account has its own Apple ID & e-mail address.

I finally tried the "nuclear option" and created new users (new Apple ID's) to see if the issue replicated across the new users. Created 2 new users (via Family Sharing) and changed profile photo several times. No change to my (Admin) photo. Changed the original user account photo and this change carried over to my (Admin) photo, but not the 2 new users. I will (eventually) delete the problematic user as I migrate the 2 new users to the new profile. At this point it seems like there is some issue with the user profile/configuration although everything is set up identical to the 2 new users. Thanks everyone for your thoughts.

They are definitely different iCloud accounts.

I just repeated a test of changing the iCloud photo by changing on one of my iOS devices - the new photo propagated across all devices except the MacBook Air (running Monterey).