1. As you are placing a market order, please note that the fill price of a market order is not guarantteed, which means that your order may be filled at any price.
2. Your paper trading orders will be cancelled automatically in the following two cases: 1) The funds involved in a pending market order are not enough to purchase the underlying asset (as a market order in paper trading cannot be splitted into multiple orders); 2) Orders remain unfilled after the market close of the second trading day.
3. If the liquidity of a stock or contract is low or if there is currently no data in the order book, the market order may remain unfilled or be cancelled.