I am having the same problem today for all the quests I complete, I didn't get rewards for any of them.
I completed Sauce Trifecta, Shake and Stir, and Patch Working.
In addition, for the Givr til you Shiver quest, I completed it, the check marks were checked and greyed out, but then they reset back and I have a Try Again button.
Just to be clear, the Rock didn't do his usual congratulatory dialogue, either. The quests are marked as completed in the Log but beyond that, nothing happens.