DRL was sitting with an ask of $14.04 for a long time. Someone came along and placed a bid for 700 shares at $14.03, then someone else for 1,000 shares. After a few moments I placed an order to buy shares at the ask price of $14.04. After a pause for a couple seconds on Thinkorswim, suddenly the $14.04 disappeared and ran away from me. My order was not filled, and instead I became the best bid at $14.04. The stock then proceeded to go up. Please describe clearly what you believe happened.