Porting from LE to SE - Purple Face and Invisible NPC Bug

[Schweini]

Normally, I successfully port Human or Elf mods from LE to SE.

My porting method is using SSE Nif Optimizer for meshes, textures and Creation Kit for esp.

But when I port other-race npc mod like Khajit or Argonian .... (for example: https://www.nexusmods.com/skyrim/mods/63819), I get Purple face bug.

And sometimes for Human follower mod (for example: https://www.nexusmods.com/skyrim/mods/73955), I get invisible NPC bug.

Does anyone know how to fix these?

Thank you!