Hi Katy:
Generally, a Project or Folder Admin should be able to see the user name in that column, or at least that's all I can reproduce locally. Can you give me a bit more information to help troubleshoot here?

1. What version of LabKey are you using?
2. What kind of table contains that column? Is it a Sample table? List? SQL Query?
3. Is there a lookup or cross-container query or similar related to that table/that 'created by' column you show clipped?
4. Is there anything unusual about userID 1220? If the Project Admin creates a new row themselves, can they see their own user name?
5. If the Project Admin uses the grid customizer, can they "follow the lookup" and also expose the "Display Name" for the "Created By" column?

--Molly