You can't select any option under Bonus Proficiencies for Order Domain in the character builder.
Thanks for the report and the screenshot (much appreciated!) - unfortunately this isn't something that one of the moderator team can resolve, so needs to wait for staff to fix this. I'm certain that will happen when staff in the US office arrive at work!
Apologies for the delay in this subclass being fully functional. If it's urgent for a game, you can customise via the character sheet to add the proficiency.
I have a similar issue with the Rakdos Cultist background. (I don't know how to add a screenshot). It gives two drop downs for skills, which excludes the book's Acrobatics and Performance skills. FOUR dropdowns for Musical Instrument PLUS a Tool Proficiency, instead of the single instrument. Languages was working as intended though.