Cannot add students to groups

Hi there,

I am starting up a second term of classes with Tinkercad, but having some trouble this time around.  I have had my students add the invitation code, but when I go to add them to groups, the screen layout does not give me the checkboxes.  Instead, I see up and down arrows beside each user, and no matter how many times I refresh or resign in, the same layout appears.  I can't check off students to add them to my groups.  Please see the image.  

I have 75 new students so organizing them into groups is VERY helpful to keep the users straight. 




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