hey, very sorry about that, that's my bad. Auto accept is back on so any 50% offer will be instantly accepted. I lowered the price of one of the cards in your offer so if you're still interested it will be cheaper. Again, sorry about all that.
the only thing I can think of might be your selected buying mode. If you don't have advanced reseller on try changing to that, it's in your Profile & Options under outgoing offers. If that doesn't work I'll email COMC support to see what's going on