Multiple fighters missing from previous weight classes!!

I dont know why you dont have fighters, whom have previously fought in a different weight class, exist in that weight class?

Conor has fought in LW, but isnt there. Volk has fought at LW but isnt there. Cejudo was originally a flyweight but isnt there. Barboza was originally a LW but isnt there. Islam is originally a LW but isnt there. Figueiredo is not available in flyweight considering hes originally from that weightless. Aljamain is originally from bantamweight but isnt there. Khamzat isnt there in welterweight. I CAN GO ON AND ON

You can see how inconsistent the roster is. Please fix this as this was not an issue in UFC 5. We are unable to play classic matchups in certain weight classes because of this. No Volk vs in Islam in LW. no Moreno vs Figueiredo in flyweight. No Conor vs Khabib in lightweight. No Cejudo vs DJ. again... I CAN GO ON AND ON