category = none parts dont show up in the parts menue

[123nick]

before 1.1.1 these parts used too show up in there own categorys ( by category i mean like how pods and fuel tanks and engines are seperated into different tabs on the left side of the screen in vab/sph), how they did this idk but now they dont and if they dont show up in there own category they dont show up at all, so i wonder what could cause this. is it because i tried using filter extensions, then got rid of it, and that broke it? is it with 1.1.1/2 ?  is it with module manager? i dont know what could cause this. infact id love too know how they work in the first place.