My sim is a grand master vampire but power points are not working.

This happens in every game I’ve played but my sims are grand masters and you are supposed to get two power points every time you fill up the bar. The bar has been filled up forever but I’m not getting any points. I make my sim use their powers, drink plasma, everything and the bat symbol appears above their heads but I never get any points when the bar is full. And it never goes back down to being not full. The vampire points work up until I get to grand master and then they don’t increase any more. I don’t know what to do. I’ve tried cheats to get more points but even the cheats don’t work.