After i prestiged once to try the new update. And now i can only get 2 coke farms. I used to have 4. 

I have 691k rep. 

you had enough rep to unlock them the first time, you do not have enough rep to unlock them (immediately) the second time. you will need more rep to reunlock the last to farms. this will happen for every prestige if you dont have the correct amount of rep when prestiging. no one knows 100% what the rep requirements are but you do need MORE rep to unlock MORE efficient coke farms / alc stills / weed farms / doctors offices

You'd need twice the rep to get 4 factories compared to before prestiging

There are tables here that you can reference to see how much reputation is required for unlocks: https://wiki.cartelempire.online/en/Areas/Production