I am not sure how all of these duos are getting created. I don’t create dups intentionally
I believe images is a Smart Group, so it would indicate that e.g. ‘Zero to Done’ exists in several groups and/or databases.
Have you checked the trash? That is one place they could be.
Have you anything external to DT, like a Hazel rule that could be sending a file multiple times?
Do you sync the database using more than one sync method? I have had this sometimes create two versions of the same file.
Are these files indexed in the Finder to DEVONthink on a Mac then synced to DEVONthink To Go?