Easel with CNC Shield

Hi,
I have a OX CNC with CNC Shield and GRBL, i have tried to use Easel, and I think is an amazing software, but I tested it with my cnc with this project and a pen:

But this is the result:


Instead if i export the GCode and use it for example with UniversalGCodeSender all works fine, can someone tell me why?

Thanks