Also, my students are working through lessons and quizzes and the overall 5th grade percentage is not budging! What are they doing wrong?

Are your students now in the new Khan Academy Reimagined?  They changed a bunch of stuff for any user in a class.  Supposedly they tested it with teachers, but I haven't yet read a post in which someone says they're a teacher and they like the new stuff.

~ Janice, KA user

Brooke Theobald,

It sounds like this is a new difficulty that started with Khan Academy Reimagined?
I've started a post to try to get teacher feedback on Khan Academy Reimagined; if you have been using Khan Academy in your classroom both before and after the change, would you be willing to post your feedback?

(I'm just another user, and I don't know if KA will use the feedback, but I think it's worth trying.
I don't remember seeing a single comment in the Support Community that says a teacher likes anything about the change. I've seen several saying they dislike aspects of it, and several saying they really want the old interface back.
I don't even know if KA had any classroom teachers test KA Reimagined; maybe KA staff just guessed what teachers wanted based on Support Community posts.

If far more classroom teachers dislike the changes than like them, KA should roll them back.)

~ Janice, KA user