BArmstrong-esristaff here is the xlsx form that won't show relevant fields.
When loading the survey in the web app, do you get following error (this happens when I load your xls form in Connect and then open in web app):
Currently the metadata calculation for property('uri:deviceid') is not supported in web app. This is causing the survey to get an error (as above) when loading in web app and will therefore the survey will not work as expected. Removing this field from your survey resolves the issue with the web app:
We have a feature request currently open to support such metadata fields in web app, I have updated the issue with your comments. We would aim to support this in a future release.