Watchtower Not Finding All Duplicates

I've been cleaning up my 1Password on my MacBook Pro.... I have an old vault with about 40 entries I wanted to remove, as long as I was sure I have them in my main vault. I moved those entries to my main vault and used Watchtower to identify duplicates so I could remove them. It found those I'd moved and I removed them.

But then I stumbled on the fact that there are a lot of duplicates in my main vault that Watchtower does not identify as duplicates. They appear to be true duplicates - all entry info is the same and the "Last edited" time stamp is exactly the same. And yet Watchtower did not identify them as duplicates.

Any idea why Watchtower isn't finding all duplicates and if there is anything I can do?

Thanks very much!!