We're using prepared group assignments with a group-set with the self sign-up option.
If students didn't sign-up for a group on forehand (which happens a lot), they still can submit work to the group assignment.
With this we get the un-satisfactory result that groups and individual students submitted work are mixed up.
In most cases you'll have to ask the student to join the group.
We would expect that if you're using a group assignment, that submitting only would be able when the student is part of a group already.
Can somebody shed a light on this behaviour?