Why are the plugs on the electric meter melted?

Please tell me, the counter in the house with traffic jams with automatic machines at 16A, the street has an electrical network. I installed a new counter, why they did not remove this one, I can’t say that the wiring is new everywhere. Sometimes a cork was knocked out either from a machine or from a kettle. They advised to change the corks new, began to twist, one cork is warm and the nest where it is inserted is also warm, changed new ones, turned on the kettle, the light went out, the cork did not knock out. I was frightened, turned it off, called an electrician, arrived, tightened up the weakened contact, put in the same new plugs again, left, turned on the machine, after 5 minutes it smelled of plastic in the counter, the plug was not knocked out. Disconnected everything, the plastic where the contact melted on the cork, called an electrician, advised me to put it on 25a, did not come, despite my panic. I removed new plugs, put in old ones, there is light in the house, the refrigerator is working, it doesn’t smell like burning. Enlighten me, please, until the morning nothing lights up in the counter, and why did the new traffic jams behave this way?