@chonkie turns out it was GTS that caused the problem, thank you and sorry for a late response.

Hey guys, I'm new here so I don't really know how to start this off, but recently I have been playing Vanilla GTA V (to complete the story) and when I came back I'm never getting any wanted rating, I'm using Menyoo and Enhanced Native Trainer and both of them have Never Wanted off, when I try to force my wanted level up it automatically jumps down to 0, could someone please help me?

TL:DR: Wanted level never changes