Currency Exchange auto-fill an amount

It should not do that, it is never useful in any possible scenario and only ever force you to pay an unintended amount.

The number just jump around as you try to make a purchase. It will auto-fill you want to buy 1513 divines for 158,272,135 exalts. You try to set your buy order for the amount you want to pay and here it goes vomiting random numbers at you.

It is a true flaw of the system, it is broken this way. I know why you want to auto-fill, but it isn't working. You just need to display current offers clearly. People can enter the amount they want. Currently, the "best ratio" often involve ridiculous offers nobody want. You want to buy some chaos for your divine orbs? Sure, best offer is 2153 chaos for 71 divines. I auto-fill this number for you now, isn't that helpful? But wait if you click ok, that offer already gone and your buy offer will brick and now you spend a billion gold, you get 5 chaos and they refund you the rest of your divines.

Never one scenario where auto-fill helps.