Thank you for
reaching out on the community and telling us about your issue. I do apologize for the issue you're having. That is a bit odd. Has this been more of a recent issue or has it happened for a while now? Normally when this does happen one of the duplicates tend to not generate an ID. One of the thing we could do is to try deceiving and then reactivating the account so they should ideally only read one sync ID.
First thing I'll
recommend is to save a backup to revert back to just in case. You can find how
to do so down below.
Next we'll try
deactivating all of the accounts. You can do so by following the article listed
Once all the accounts are
deactivated go ahead and follow the article here on reconnecting the accounts.
It may take a couple of days to find out but double check to see if we're still getting duplicates with two different ID's if we are let us know and we'll see what we can do next.