Ok, it's really weird, I tried to reproduce the problem above with a test course and 2 testquizzes. And: I can't reproduce the error. However, in my real course, the problem persists: Even though I hit the regrade button, the (unlocked) values in the grade report still differ from the (correct) values displayed in the quiz->results tab.
If anyone anytime experiences something similar, let me know!
Gradebook
Grader Report does not update when doing a regrade
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