CC in folder but not showing up in-game

Hi! I've been having this really weird problem with my CC lately. I switched computers a few months back, I put all the files (yes I checked and double checked it was all of them) onto a USB and then put them all in the sims 4 mods folder of my new laptop. However, over half of my custom content is just mysteriously not showing up in game (Mind you I used them in my previous laptop just that day before i switched)? I checked the folder and it all seems to be there but  most of it isn't showing up in game. I don't have any missing meshes or necessary items. I thought "maybe something just went funny during the switch and it lost the files, who knows." but the problem gets weirder. I went to the sims resource downloaded some BRAND NEW CC items (all without needed meshes or with meshes included) and now those aren't showing up either. I downloaded a variety of items, mostly CAS items, clothing, hairs, makeup, a few bits of furniture and stuck the files from my downloads directly into my mods folder and they aren't showing up either. None of them. I've tried every trickity trick I've read about creating a new mods folder or entirely new sims 4 folder and even that hasn't worked. It's like my game is suck on an old version when I only had those few items in the folder or something but all my other items are in the folder! 

Can somebody helps please! I really want to be able to make actually good sims again!