It appears that the change in your kids’ QID number upon re-entry into Qatar is not standard protocol. Typically, a Qatar ID number issued once will remain the same for an expatriate resident even if they cancel their residence permit and come back on a new residence permit.

Regarding health cards, residents of Qatar can renew their health cards using the old QID number through the Hukoomi portal. If you need a replacement health card, you can visit the nearest health center and request one, bringing a copy of the QID, a valid residence permit, and the old health card. It’s advisable to check with the relevant authorities or the Hukoomi portal for the most accurate and updated information regarding your situation