DSM 7.2 Data Scrubbing issue?

[perseid]

Hi, I performed a complete manual data scrubbing in my DS1618+ (62TB), the whole process took 38 hours to complete. I was able to regularly check the scrubbing process status indicating percentage completes and time remaining. As the process was ending, showing 2 minutes to complete the percentage completed was showing 68%, and eventually the process ended "successfully" when the percentage indicated 69%. Is it normal that data scrubbing ends at a value less than 100%? If not, is this an indication of some issue? Thanks