Thing is that the modding guide actually warns you about the possibility of several mods modifying the same file and gives a workaround so that said mods can play nice with each other. However said workaround is not working. That's why I consider it a bug, if I hadn't read the modding guide, I wouldn't have given it a second thought.
There is also the fact that both me and the author of "any race mod" can't use certain mods in conjunction on a windows 10, but he claims that he CAN on a windows 7.