In Boost theme clicking on Quick grading show form change popup about form has been changed, do you want to leave. This doesn't happen on clean theme.

Steps to Reproduce:

1. Login as a teacher, access the assignment and follow the 'View all submissions' link.
2. Untick the 'Allow quick grading' checkbox and it will show popup
3. Accept popup and page reloads
4. Check status of 'Allow quick grading' it is still checked.

NOTE: If 'Allow quick grading' is unticked then tick this and revisit the page, to see checkbox is not unchecked.