I have a feeling it has something to do with the Domain - when the field worker changes from Incomplete (what I assigned everything to in Pro) to any of the other options, it moves them into an Other box with no symbology. I have to individually match the colors for the Other options to make them visible, which is not a great option. This has happened to other projects of mine as well, and it just recently started happening maybe a few months ago. It also would be great to have no duplicate labels in the legend. Is there a workflow to avoid this happening?
Can you share the map and layer? I think it might be an issue with the value that is set on style and the value that is stored on the feature is different.