Read-only flexfield is still changeable in Job Application Flow on Career Site

Hello everyone,

I have created some Person Extensible Flexfields, in which I have set the context segments to be read-only and I have specified a constant value. I added these flexfields to my job application flow and on the career site the constant value is selected, however the field is not read-only, given that the user can still edit and select one of the other values.

Does anybody know why this bug is happening and if there's a way to fix it?

Thank you,

Elisa