I have updated to 100.1 version, but they were weak before I did the hotfix. Maybe that has something to do with it.

However, as with yesterday, after I had the game turned off while I slept, the health bar went up, and the last kid who went down to extremely weak has a half health bar now. Not sure if this is still considered weak as he's exhausted at the moment.

Thanks for all the suggestions & help.