Hello,
I have always had the following problem (now in Moodle 3.9), which I never tried to resolve, because grades are correctly reported in the grade book, and students see their grades and feedbacks, as expected.
When switching to the last phase, red crosses appear although I clicked on recalculate grades.
I wonder though why this is so and if there is some problem I have not noticed.
Thank you for your suggesions !