Maybe someone understands the electrical installation?

Hello, I have a mains water pump that supplies water to three houses, so it is connected to a separate meter from our box.

That meter broke a couple of years ago, so it had to be replaced. I’m not an electrician myself, but I have a basic understanding of how everything is connected and how to work safely, so I changed it myself (I connected everything as it was on the old one, and that’s it). But I am very stuck with how the ground wire is connected.

Maybe someone understands and could comment on whether this is normal and not dangerous? Why is it so connected? I really didn’t expect such a connection. Everything has been working for over a year, but somehow it still doesn’t give me peace.

thank you