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

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