Hi Jacek,
The broker isn’t messing with your EAs :-)
The EAs open trades at the opening of the bar following confirmation that the rules of the strategy have been met. On an H1 chart, that happens on the hour.
In terms of Grid Machine, I’m afraid because this is a 3rd party EA, we have no access to the code, so I really cannot say what’s happening there. I can only suggest you reach out the developer and see if he replies with some insight.
Thanks,
Ilan