It might also be, that you can't afford cancelling it. It costs a small fee each time you open or cancel an order. As you can see, the fee is "0.00121" and you can't cancel that, if you don't have other tokens or BTS to cover that fee.
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thanks @rawbinhutt for adding that, something I didn't realize as well!
I don't have anything to pay fee. Why they do not deduct the fee from my open orders?
You can convert just a small amount of your SBD to BTS on Blocktrades.us
Then you have BTS to cover costs.