Submitted orders can be cancelled by itself

[localappleseed]

I am using the following code to submit orders in onBarUpdate():
myOrderPrice = GetCurrentBid() - 0.10;
myEntryOrder = EnterLongLimit(myOrderPrice);

then quickly without calling CancelOrder(), the order is called by itself from checking the orderState inside of OnOrderUpdate():
the OnOrderUpdate() is called several times, its OrderState is changing from
submitted -> accepted -> working -> CancelPending -> CancelSubmitted -> cancelled

Any possible reasons this order can be cancelled by itself?

Thanks.

[localappleseed]

I know the answer now, need to set isLiveUntilCancelled