There could actually be a couple of reasons for this. The first reason could be the option for the student display option was not switched to "yes" when assigning. If this happened, the skills were assigned to the modules themselves but simply weren't sent to the "Assignments" tab. The students can still access the skill by going directly to the subject module it was assigned in.

The second reason this may be happening is if the subject is hidden from your student. If a subject is hidden, it will not allow manually assigned skills to populate in the "Assignments" section. However, as soon as it is unhidden, your assignments will show. To review hidden modules for your entire class, click here. To review hidden modules for individual students, click here.