I didn’t know back then it was so easy to have a similar problem but I still think removing “duplicates” based on System UniqueID should not be done by default…
Maybe you would need to click a checkbox, a different disposition choice (maybe “final disposition” or something similar…).
Maybe the default choices could be done through a settings page, etc…
There should be a way to filter those out or have them displayed differently if that is what you want however…