Issues with the Course Mastery Page (Teacher)

I'm a teacher who has been using Khan Academy with my students all year. It's been a great tool during remote learning!

Recently, the last week or two, I have been having an issue where when I try to load the Course Mastery Progress tab, it keeps telling me I need to "Add Students." It has been working perfectly fine all year and I still have over 70 students enrolled in that particular course.

Sometimes, reloading the page half a dozen times works. Any ideas for how to fix this issue?