OK, finally I've gotten to the bottom of this. Not a WeBWorK problem at all, really.
We use LTI with Moodle, and the default setting is course grade.
This is a (late career) professor using WeBWorK for the first time because we're teaching remotely and he sort of has to.
The 'average' he was referring to turns out to be the average over different assessments.
Currently he has a quiz, and has just added a homework set as well. So of course, the grade reported to the Moodle gradebook went down, because students haven't started the homework yet.
We use LTI with Moodle, and the default setting is course grade.
This is a (late career) professor using WeBWorK for the first time because we're teaching remotely and he sort of has to.
The 'average' he was referring to turns out to be the average over different assessments.
Currently he has a quiz, and has just added a homework set as well. So of course, the grade reported to the Moodle gradebook went down, because students haven't started the homework yet.