Hi ChrisMancini,
Thanks for feedback.
According to your description, I create an app based on Excel table to test this issue.
On the EditForm, there is a Dropdown control with Yes, No, N/A. I set Yes as the default value.
When click the SubmitForm button, the value I selected will be saved to the Excel table without error.
While when I select an item and navigate from the BrowseGallery screen to the EditForm screen, I found that the value in the Dropdown is the default value “Yes” but not the one I selected before.


Then I try to set the Default value of the Dropdown as BrowseGallery1.Selected.YES_x002f_NO, the issue won’t occur. The value on the EditForm screen will be what I saved.
Please try it on your side. Hope this could be a workaround.
Best regards,
Mabel Mao