Hey Robert, thanks for reaching out! Apologies for the inconvenience, I've notified our engineers about this as we're always looking to make the product better and this feedback is super helpful for us.
In this case, if you'd like to be certain that leads are not being duplicating upon search, I would suggest unifying them into a single people search table using our 'Write to Table' function or copying and pasting the essential columns containing lead data from the various searches into a single people search table.
Hope this helps! Let me know how this goes and if you'd like a hand setting this up :)