TFS Check-in note Fields different per user?

Question

I have a Team Project set up with custom Check-in Notes : "Ticket" and "Code Reviewer". This is displayed to all in-house users on check-in. However, when the one external dev tries to check in, he is presented with the default "Code Reviewer","Performance Reviewer","Security Reviewer". I haven't found anything different between his permissioning and the in-house dev's. Why would one person see different fields?