just learnt a lesson, page-6

unfortunately yes. Your price was simply not available because it gapped up. So, they take the next best price.

"A limit order is an order to buy or sell a contract at a specified price or better."

I would ask them how you can enter an order so that you get in at that price or cancel the order.

Just wanted to say thanks for sharing that lesson, I am sure it saves a lot other traders from a similar experience.