cbworkloadgen progress bar reporting incorrectly

Sometimes when I run the cbworkloadgen the progress bar is reporting incorrectly, it goes OVER 100%. Screenshot will be attached. I am not sure what triggers this but it happens a lot of the time.

Here is the command:

./cbworkloadgen -n 172.23.104.110:8091 -u Administrator -p password --bucket=default -i 1500000 -s 100 -t 10 -j --prefix=key3_ -r 100