Currency Exchange ends early, taking gold.

When posting an item in bulk, the currency exchange often fails to sell the item, and completes the order returning the items.

I list 100 items for 695 exalts. It takes an absurd amount of gold away from me.
It sells 30 items, completes the order, returning 70 unsold items, and keeps the Absurd amount of gold I spent to list the item, when what I wanted to do, was sell 100 items.

Please fix this bug so the order does not arbitrarily end on a whim, or are currency exchange orders supposed to be timed?