Masih, hi!
My guess is that you have 2mm set in your batch file. 6 mm is indeed the default if there is no other setting provided in either the command line (which has the highest priority) or the batch file (which has the priority over the defaults). If you have started from the provided example template batch file and have not removed or changed the settings in the example batch file, then the example 2mm would have remained and would be used.
To provide you with a more complete response, I would need to see your specific call, batch file and logs as per issue reporting guide.
All the best,
Grega