Edit: Just got off the horn with ESRI Tech support. This is a known bug.
I try to enable editor tracking on only the editor name and edit date fields on my feature classes in a file geodatabase, I don't want creator fields. However ArcGIS Pro 2.8.1 keeps setting the fields I select for Editor and Edit date as the Creator and Creation date fields. Works just fine in ArcCatalog 10.5.1 when I set the editor tracking there.. It also used to work just fine in ArcGIS Pro. This has to be a bug. Any thoughts?