saving preset - annoying behavior

I am trying to create a “ok” preset for Smashwords, but I can not save my settings.
In image below, I try to change the Level1 (2, 3) font size and save a preset named Smashword.
No matter what I change, the field Format As return to “Custom”.

It’s astouding that a famous software like Scrivener presents a behavior of a 13th class software.
How can I bypass that (forgive the bad word) true disgrace? I wan that any alteration save in Smashwords preset.