Quote from pik_d :

Did you use the exact same set for multiple configurations?

yes

Hm yeah the system will skip setups that are 100% equal to one you already have in your collection.
It will now add the tracks to that already uploaded setup though, so you don't have to manually do that.
You can safely import those hotlap setups again to try.

Tables can break if someone selects every RO track for a set:

https://www.lfs.net/files/setups/user/596974

Also, if someone uploads the exact same set as someone else, could they get a message that this is the case?

For example, Pete and I both uploaded this set. Could there be a message above "Car & Name" saying "This set is identical to another set and will not be displayed publicly"?

fbm blackwood historic setup for racing

Quote from bick black :

fbm blackwood historic setup for racing

https://www.lfs.net/files/setups/FBM/BL10