Sorry, I’ll try and be more clear..home designer and chief have an internal symbol mapping that happens within the software separate from a base UV map being applied to a mesh. This is by intent in order to expedite the process of complicated mapping on cabinet doors but when you export, this internal UV remapping is no longer applied and the base UV map is exported. This is expected behavior. You would need someone in the chief premier line make you a custom door symbol if you wanted the stiles and rails independently mapped.
Renerabbitt's post in How to display interior in Window Spec dialog was marked as the answer