NOTICE: Read the Forum Rules and check for Known Issues before posting!
I noticed that the number of scrolls per stack sell option changed when this bug took place. My Aetheric Core upgrade to level 10 appears to have bugged out my ability to sell scrolls at the consignment broker.
Answers
Yes, this issue has been posted in the bugs section, it seems that reaching level 10 in the aetheric core makes it so that you can only buy/sell a single 12 page stack per token.
This is a pretty critical bug. It needs to be fixed ASAP.