Lost Progress

I was using Khan Academy online (Google) and was doing Grade 6 and Grade 7 Math, my Grade 6 Math progress is doing fine but I lost almost all progress made on Grade 7 Math (65%+ went to 5%), I checked and I remember I was signed in the whole time.
But if something went wrong, I think it was when I updated my Google and it refreshed my Khan Academy, signing me out when I didn't notice.
I don't really know what made me lose all my progress but Khan Academy help center, if possible, please restore my lost progress.