The crypto market is highly volatile. During the Swap process, there could be order slippage caused by an extreme market fluctuation. This slippage is inevitable during such a market situation and it will lead to a different amount from the one you swap for at the time of placing an order. In such a case, you could either receive more or receive less according to the price ups and downs. For example, if the price of the token you swap for increases during the swap process, the amount you receive could be less. On the opposite, if the price of the token you swap for drops, the amount you receive will be more.