Open the Manage Students view for a run in two different tabs
In tab 1 move a student (example aa0101) to another workgroup (example Team 101)
In tab 2 move the same student (example aa0101) to another different workgroup (example Team 102)
The student aa0101 will now be in Team 101 and Team 102
Method 2 to reproduce the problem
Open the Manage students view for a run
Click "New Team" and add a student (example aa0101) to the new team and click "Create" and then "Proceed". It will say "New Team 103 has been created." but it will not show Team 103 and aa0101 will still be in their original team.
Drag aa0101 to an existing team (example Team 102)
The student aa0101 will now be in Team 102 and Team 103
Method 1 to reproduce the problem
Method 2 to reproduce the problem