What is the revision of UIM?
Is the reason for the duplicates known?
If not you may want to start with that to prevent it from happening again.
Figuring many of the dups will be under the same hub/s you can:
rename C:\Program Files (x86)\Nimsoft\hub\robot.sds
Then restart the hub (in the IM console select the hub in the tree > right click Restart).
Then robots.sds will be automatically recreated without any robots and as they connect back to the hub they get added.
Restart the robots to speed up the process.