Two quesitions:
1) What might be causing this to occur
2) Do I need to concern myself with it?
Reason I ask #2 is that the "Cancel pending" order is never subsequently filled even if price trades through it...
Obviously I would like to avoid producing this state, but to the extent it occurs and is benign then that would be good to know as well...
Below is a screenshot of the order in question along with the log window:
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