Hi James,
I took a look at your xlsx file and published a new survey to AGO with your xlsx and the media csv file. I am unable to reproduce the problem you reported. When I complete a new survey, fill in all fields, open a completed survey via the Inbox, I see the Region and Community fields completed with the previously selected answer. They are both working as expected.
What version of Survey123 Connect and field app are you using? Also are you using AGO or Portal (version)? And on what devices and OS version?
Regards,
Phil.