Hi @PowerAnalytics,
Do you mean that the issue only appears in your Mobile device?
I have made a test on my side, and don't have the issue that you mentioned. I think this issue is not related to the Choice field in your SP list.
Please make sure the Item property of the Display form control is set to following:
BrowseGallery.Selected
Please also take a try to turn off/disable the "Improved app rendering (final validation)" option and "Delayed load" option within Advanced settings of App settings of your app, then re-publish your app, then try your PowerApps Mobile App again, check if the issue is solved.
In addition, please also check if the version of your PowerApps Mobile App in your Mobile device is the latest version, if not, please upgrade it into the latest version, then check if the issue still exists.
If the issue still exists, please consider re-create your app or re-install PowerApps Mobile App in your Mobile device, then check if the issue is solved.
Best regards,
Kris
Community Support Team _ Kris Dai
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.