To change this first click the output button, then move all the modules to unassigned, click the output button again and reassign all the modules back in. Looking at them they should all show an O to the right of them for output. Click 'OK' and then go back into the role and look at the modules, the ones that had a B on them before once again have a B on them. This is a concern as if they have a B on them a user would be able to resubmit them when they are in the history, which could cause problems.
You need to highlight the module you want to change from Both to Output in the assigned column, then click on the output radio button, and click apply.