NScan 'Group Entry by Order' not functioning properly on Zebra TC22?

We recently updated our NScan devices from Zebra TC200J to TC22, and are encountering a strange issue.

We use the 'Group Entry by Order' to enter our School/Tour Groups, our front facing staff often need to edit the quantity to accurately reflect how many folks are in attendance.  For some reason, whenever we try to click the field to change the quantity we're unable to edit it? We didn't encounter this issue on the TC200Js. 

(Circled the field we're no longer able to edit on our new scanners) 

I'm curious if this is an issue anyone else has encountered! I'll also add that we're still using v15. 

It's got my organization's IT Team stumped. Any insight or workarounds are deeply appreciated!