In Employee Self Service, Preferred Name becomes First Name

EBS HCM 12.2.11

We have a very limited Emp Self Service. The only data updatable for Personal Information is the Preferred Name.

We've just discovered that when entering a Preferred Name thru ESS, it becomes the First Name within the ESS webpages.

The core forms are correct in that the Preferred Name is in parenthesis.

Is there a Profile Option for this? What am I missing? I've attached screen shots of what's happening in ESS.

TIA for any guidance, Laura