Oracle AQ dequeue process

Hi, i found one strange thing in dequeue process.
I have a trigger (after insert) called trigA that perform enqueue process,and it is attached to a table called Student.
And i have a stored procedure called notifyDeq that has beed registered to receive PL/SQL notification and perform dequeue process.
Suppose there is a empty queue called AQQUEUE, when i insert a new record into table Student, the AQQUEUE contains two message payload.
Then the message propagation happens. After message propagation, there is remaining one message in AQQUEUE.
Questions:
1) Why two messages are inserted into queue while i inserted only one record?
2) After message propagation, the message have not been passed to notifyDeq stored procedure. But why the AQQUEUE statistic still show that one message has been propagated?
Many many many thanks!!! Pls help!

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====================================
I assume you mean something like: Yes
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I assume you mean something like: Yes
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What sort of transformation? Rotation, Shift, Scale, Coordinate rounding? Transform from UTM to LatLng
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What do you mean by this? Write them out as WKT/KML/GML? Google map encoded polylines
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1,355474.91,5405822.39
1,359049.08,5410400.89
1,354797.2,5407755.57
1,357437.46,5406457.67
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