Since the last update of Bridge ( October 2022 ) I've notices somethink strange. When you select and rank your photos, sometimes Bridge almost immediately removes the rank from the photos. If anybody has an idea how to solve this problem, or what is happening , I would be grateful to share it .
Problem or error
Just to verify, what you are calling "rank" is listed as "Rating" (seen as "stars") within Bridge?
Is there any chance you inadvertently tapping the zero key? (that will remove any rating or label.
Also, do you have your Preferences set to require the Command/Control key to be pressed with any of the number keys to place a Rating or Label? If you have that turned it off, please try turning that open back on.
In short though, I've not seen that nor have I heard of this before.,