Try:
Copy DP_AtrisRb1H.mdl (from the add-on) to somewhere, rename to DPFBM1H.mdl
Do the same for the DP_AtrisRb1H.mdx file -> DPFBM1H.mdx
Copy both back to your Override folder, replace.
Ok, you may have another mod that's taking precedence. For example an HD textures mod.
You can do a filename search in the location of your workshop mods (or even a whole drive), to find clues about what is going on. For example search for P_Bao_DurH (main head texture).
If you find more than 1 file then there's a conflict.
P.s. there's also workshop versions, but it's wise to track down the problem first.