Bo3 deck loads in with 7-card sideboard.

I don't know why but this keeps happening to me. Select traditional standard as deck type, fill in sideboard. Load up deck, click on deck, verify 15 card sideboard and traditional standard. Click start game - only top 7 cards in sb.

go back to the deck after leaving the match, look at the deck, still listed as "Traditional Standard" but now with only the first 7 sb cards.