How to run multiple instances of same test with Robo

I have configured codeception and robo exactly as they say on his website:

https://codeception.com/docs/12-ParallelExecution

I have done an acceptance test. At the end I run robo parallel:run as they say in the documentation, but it only runs 1 instance when in the console appears to be running 5 processes. Maybe is something I'm not getting, I'd really appreciate some help.

This is the console log when I run robo parallel:run:

$ robo parallel:run
 [ParallelExec] call D:\Programas\xampp\htdocs\robo2\vendor\bin\codecept.bat run acceptance --group paracept_1 --xml tests/_log/result_1.xml
 [ParallelExec] call D:\Programas\xampp\htdocs\robo2\vendor\bin\codecept.bat run acceptance --group paracept_2 --xml tests/_log/result_2.xml
 [ParallelExec] call D:\Programas\xampp\htdocs\robo2\vendor\bin\codecept.bat run acceptance --group paracept_3 --xml tests/_log/result_3.xml
 [ParallelExec] call D:\Programas\xampp\htdocs\robo2\vendor\bin\codecept.bat run acceptance --group paracept_4 --xml tests/_log/result_4.xml
 [ParallelExec] call D:\Programas\xampp\htdocs\robo2\vendor\bin\codecept.bat run acceptance --group paracept_5 --xml tests/_log/result_5.xml
 5/5 [============================] 100%
 [ParallelExec] 5 processes finished running
 [ParallelExec] Done in 43.315s