Review on Coffee maker VITEK VT-1517 BN, brown by Bogusia Nagrska ᠌

I make a double cappuccino every morning. Accordingly, all manipulations are the same: I pour milk (3.5-6%), turn it on, pour a double portion of coffee into the cone, put a large mug, turn on the double cappuccino button. And the volume is obtained in different ways, then 150, then 350 ml, I don’t know why, then you have to make another portion of coffee or add additional foam. I don't understand what is causing the problem. And the coffee is delicious, the foam is dense.