So UE4 doesn’t do any type of converting of height map to normal map? Hmmm. Okay, that helps a lot. So it’s not really a normal map, but it just looks like one for some reason.
The FBX I imported in has no normal map, just a height map aka bump map for the body & head (one for head, another one for body). Somehow the bump/height map turned into a normal map and ended up in the normalmap node of the material.