Orders in NKX can have several states, which are visible in Your Actual orders or Your Orders history tab under Trade options pane.
Here are explanations for each state:
validating - order is waiting to be validated and/or for budget allocation
active - order is in market and waiting to be executed
executed - order was fully executed
rejected - order was discarded (validation failed)
canceled - order was canceled either by user, or by one of the backend contolling mechanisms