Mailmark reject with a Mailmark barcode

Why would a Mailmark reject would have a Mailmark barcode?

I am guessing there will be various reasons depending on the reason for reject...

However, if you have ‘Allow Auto DPS Level Adjustment’ set to ‘Yes’ in your Master/Client/Job settings then this would explain it. as qualified records will be removed to raise the DPS level.

Navigate to the below to confirm: 

‘Tools > Options > Master/Client/Job > Royal Mail Sort > Run Time – General Settings > Allow Auto DPS Level Adjustment’