Normal, especially for a daycare environment where there is a lot of foot traffic. The carpet relaxes after a couple of years and as soon as moisture hits it, it bubbles up. I've see this happen immediately when sprayed by my HF sprayer. I then know i'm in for a wild ride and need to educate the customer whats about to happen. I can see your hallway is a nightmare install. It's hard to get a proper stretch on a carpet when there are so many door ways to cut in, especially after install and the seams are attached. Then there is a the main room. A carpet should be stretched from 7 different steps/directions. I would bet money the installer just slapped that carpet down, got the check, and had a nice day. If the carpet is glued down, then it can't be stretched. What happens there is after time the glue wears out from constant walking on and kids driving toy trucks around. The glue becomes a fine powder. This a booby trap waiting to happen for carpet cleaners. The only way to fix this if the bubbles remain after dried is to inject glue in the bubble areas and roll the carpet back down with a weighted roller. OR, pull the entire carpet and reinstall.
Most likely the carpet will settle back down once dried out. Please post a pic in a few days. This is pretty common.
Upon closer examination of the pic, are there even any tac strips used on this carper? Seeing how it's curled up at the glass doors make me thing no.