Various things won't update? (spell slots, attacks, etc.)

My players have leveled up, and I've been messing with NPCs but lots of stuff doesn't seem to change? Their spell slots won't update for their level, when I change an NPC's attacks their damage and To Hit: won't update, and a few other minor things I forgot. Why is this happening? I googled the spell slots issue a little while back but I just found a post that had 0 replies and got shut down. Does anyone know a solution?

Oops. The NPC attacks were me looking at it really wrong. But the spell slots issue still stands. Even with manually doing extra spell slots modifier in the character sheet settings stuff it won't update.

A couple questions:  1) What game is this? 2) What character sheet are you using? A screenshot would help here.