Briefly describe (1-2 sentences) the bug you’re experiencing:
My team started using the Asana created priority custom field, however, one of my teammates created a different title for the field instead of using the existing field name from the global library. We now have duplicate field titles for priority ranking (one called priority and another called priority rank) in the multiple different projects for tasks.
I am an Admin for the account that manages all of our fields and can’t merge the duplicate field titles. See the screenshot below of the warning yellow alert I am receiving.
As @Charlie_Pilch explained, it’s no possible to edit or delete Asana Custom Fields.
As he recommended, you could try editing the Custom Field your colleague has created.
You can learn how to edit Custom Fields in this handy Guide article: Custom Fields • Asana