After introducing Christmas event version of the game, I have noticed it is not possible to bid on any of the "Add content to a deposit" item selecting value more than 25. It was possible before to bid e.g. 200 gold coins for 1000 value Iron deposit.
But you are not able to do that now, since you can select maximum value of 25 Iron deposit as a request for your coins.
You are able only to select correct value if selling the deposit now.