I'd like to preface this with the fact that I started having this issue after using mods for over 80 hours without any issues. Also, this is a repost of my earlier post.
Alright, down to the details... I installed NMC's large texture pack and started a new game to test it. I began walking around and murdering everyone in Goodsprings (testing lag, stability, visuals, etc.). After decapitating a few NPCs, I noticed that they had a second, larger neck stump around/through their normal one. I eventually made my way to Doc Mitchell's house and did the same to him. For whatever reason, I went outside and came back, when I entered his house, all of the limbs that had been taken off post-mortem had doubled. His head also had a clone that was missing hair, teeth, and eyes. I looked around and found consistent results with the other NPCs. I have disabled my mods, reinstalled them, started new games, sorted my load order, etc. and this is still happening. I've been able to find 3 other instances of this online, only 1 of which went into detail. E.PD. Gaffney was that person, they tried several solutions to no avail, and as of Aug 10, 2020 @ 12:10pm he had no solution. Below I will post my load order. (Note:it has changed since the problem began.)