It might not be "wrong" exactly, but it looks like the circuit labels need to be changed. When you want something to do, turn each MCB off (one at a time) and see what stops working. Put a new label over each MCB (I like to use white vinyl tape and a permanent marker; looks neat, and if you ever need to, you can scrape it off and redo). The 5A MCBs are likely to be lights, the 15A an immersion heater, the 32A sockets, the other 32A might be an electric cooker, the 40A either an electric shower or a big electric cooker. The 40A MCB on the right looks to me to be newer than the others.
It will be interesting to see what circuits the RCD (extreme left) controls.
Quite possibly when your electrician fitted the new shower, he added an extra MCB and/or RCD or moved things about and did not update the labelling.
Once the labels are up to date it may be easy to see why on one socket the microwave trips the RCD, and on another it doesn't. RCDs are usually provided to protect showers and/or sockets that can reasonably be expected to supply tools used outside, like a lawn mower or hedge trimmer (or just do all the [downstairs] sockets for simplicity); and/or sockets in a room that is not a bathroom but has a shower in it. when an RCD trips it is often because of damp getting into an appliance like a kettle, washing machine, immersion heater. Sometimes no single appliance has a significant fault, it can be a few that each have very slight leakage that add together. Cookers and freezers usually don't have RCD protection.
The good news is that walking round the house to identify circuits need not cost you anything, you can easily do it yourself. Don't start opening covers or poking at wires.