PP is defined as 5-second max power and is important for sprints and very short duration efforts, so if that’s important to you, you want it to go up and will be happy when it does.
If more endurance focused, having it ball-park correct is all that’s required for other signature parameters to be correct. See @ManofSteele’s response here
As it’s defined as 5-sec power, you shouldn’t be able to put out more than PP for 5 seconds or more - if you do, it’s a BT and your signature is re-set. Maybe you exceeded it for less than 5 seconds?