This sounds like an instance of Sync deletes stuff. Itâs a bug that very very rarely affects people but it does in your kind of scenario. Sometimes the data is captured in archive, but sometimes DynaList just decides the other takes priority and doesnât record it. If the former, itâs possible the admins can retrieve from their archive.
If the structure of your data editing matches the description there, do tell. If it doesnât match, then itâs something else.