Not sure exactly what happened but if you look at the IN-O report for that part and day and look at the audit info, is the time stamp identical for all of the entries?  That will help determine if it is duplicate entries or some kind of loop that created multiple different entries.  Although if it is from a loop, they may all have been generated within 1 second so if they are the same it isn't definitive but if they are different then it tells us something.  Not sure what, but something.  Is it a Lot or Serial Controlled item?