Interpretation of result output - COGI (Background - CORUAFWP)

A background job(CORUAFWP) is scheduled, which runs once a day for clearing COGI errors, the output of background job has following numerical data

Number of total items :1726

Number of locked items : 0

Number of incorrect items :1720

Number of withdrawn items :0

Even though there is no clearing of COGI errors, why there is difference of 6 (between total items

and incorrect items)

Note:

Other day, there was 1 material document posted in background processing with following numerical data output

Number of total items : 1723

Number of locked items : 0

Number of incorrect items : 1716

Number of withdrawn items : 1

As one can notice, net difference between total items and incorrect items is 7 (while, only 1 item is withdrawn)

and six items is open question

Thanks,