Requirements that are currently marked as complete may change to in progress or incomplete after adjusting the total number of credits on another requirement. We can also see this occur when editing a requirement and clicking Ok. No changes are made to the requirement but the degree will drop all courses to the additional courses section. When doing this process while the courses are all listed as additional courses the degree will now show correctly.
We resolved this issue in version 7.82.104, patch 19. Download and install the latest patch, which contains all fixes from previous patches. If you are running an older version, download and install the latest version and then the patch.