Hello!
1) ABB introductory machine for 25 A, so it makes no sense to put a machine after the counter at a higher value, since it will be useless. In the event of an overload, the 25 A circuit breaker will turn off, the 63 A circuit breaker will only protect against short circuits.
If the machine is in front of the 25 A meter, then the circuit is safe. The main thing is not to change the machine in front of the counter for a rating higher than 40 A, since the meter itself is designed for a load current of no more than 60 A.
2) There are no errors in the fact that zero is entered into the machine. For safety, in the event of electrical work in the home wiring, it is preferable to have a break, both phase conductors and zero. But a four-pole machine is usually placed at the wiring input, but in your case for some reason they put a four-pole on one line, a three-pole on the other - I don't see the point in that.
3) At the expense of the connection - if the contacts are tightened well, then everything is correct. If one of the lines was incorrectly connected, then some section of the wiring would not work for you.
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