Hello Ramana,
Since you are moving the files around, each file event detects a newer version of the file all the time making the event fire.
So file comes in in 'in', event fired, move file to 'out', file detected in 'out', raise event, move to 'in' etc...
The file events do not care about what happens to their files in the mean time, they are only looking out for files that match their pattern that they have not seen before (timestamp).
Hope this helps.
Regards Gerben