The upgrade skills area for the user is bugged (I'm in sandbox mode), whereby it doesn't matter if the points are available or not, I can keep clicking the attribute to upgrade all the way to 99 and press finished and it accepts it. The counter on the pop up does display a minus (e.g. -30 points available) but it doesn't stop it from accepting/saving the upgrade.
I hope this is easy enough for you to replicate on your side, but please let me know if you need more info.