Auction house taking higher insertion fee than listed

[Impero]

Tested this earlier today, put up an item for 10 silvers. I have premium rank 4. It said registration fee was 20 coppers, and additional registration fee was 24 coppers (I'm guessing that's the non premium fee). So I clicked sell and it took 27 coppers from me. I know it was that exact amount because I had on me exactly 34 silvers, and 27 coppers before I clicked.

 

I'll have to test it more when I get home from work, but the auction house should definitely be looked at for bugs.

[Impero]

Really this still hasn't been looked at or acknowledged? This is a pretty big deal, premium members aren't getting a feature they paid for, and sometimes they're even paying MORE than what's listed.