Hi Matt,
If you still have a way of retrieving the XML as it was before you fixed the issue, it would be informative to see the two side by side - at least, the parts of the XML where you needed to make your changes. If that’s not possible, we may just need to revisit this if the issue recurs since there isn’t quite enough information to be able to reproduce the issue.
If you can try adding the field to a new page from inside the Page Composer (not via XML), and let us know if the issue presents itself again, that will be helpful too.
