I had a problem with this mod called "The Book of UUNP Volumes 1 2 and 3 - UNP - Sevenbase - UNPB". It made some of the guards in the towns have no bodies. Only head, hands, boots and weapons. The solution was to go to where my steam games are in the steam folder and then go to:
(Skyrim Special Edition > Data > Meshes > BookofUUNP) and then remove the "Cloaks" folder. Then I had to reset the inventories of all the guards by opening the console and click on them, then type resetinventory. Just thought you should know this as it actually takes a lot of time to find the solution. It seems like the cloaks are causing the issue so it might not be compatible some mod.