I think they’ve got carried away with the increased demand this season. They offered people a guaranteed refund for listing these tickets, thinking they’d sell them but at £58-£75, and with so many games coming up people have said no thanks, and it’s bitten them on the arse.
They did a similar thing but to a lesser extent against Liverpool, when a load of tickets went on sale the day before the game that didn’t sell, seats I can only assume they had held back to sell as offsite hospitality or something.
Demand has clearly gone up this season but evidently not as much as the club thinks it has.