Greetings all!

Does anyone knows how to remove those bugged twins of NPCs with some mods, particularly with the underground 2? Knowing that the debug patches are installed?

Thxs!

I assume you mean duplicated NPCs.
Having the Code Patch installed will usually prevent most of these, but you'll need to repair/update your save file with Wrye Mash if you want to remove them now.

Also post your load order, you may have a duplicate esp that is causes this.