Why did my bet end as unplaced?

Unplaced bet usually happens because the prices on the BLACK trading platform are updating constantly and the software didn't execute the price that you have set. BetInAsia BLACK will always try to place your order at the highest price possible with the highest desired stake, but if, at no instance does the actual price meet your placed price, the bet will end up as failed.

Here you can read more on how to place a bet on BLACK.