Not sure why we are getting duplicates all of a sudden on some values.

It might be something with an old version causing syncing issues? Is there a way to change the syncing to only only sync if the incoming data is from another player with the latest version of the add-on?

yes, thats because of old versions and users updating their addon. They have their database corrupted and after update they sync their corrupted database to new versions.

Is there a way to prevent old versions of the addon from syncing? Or at least prior to the version that was very broken.