So I like to drink cappuccino or latte at home, but I don't have money for buying espresso machine so I am making them using Bialetti Moka Pot and Bellman Stovetop Steamer. I have been working with the steamer for about a month, and a lot of time, I experienced having many tiny bubbles in the milk when I was steaming. When I turned on the steamer with steam wand in the milk, there are a lot of small bubbles coming out from the steam wand, and those bubbles caused the foam expand way more than I want it to be, also bubbles remained at the center of the whirlpool and never disappeared. However, I also had the day with no bubbles coming out the steam wand making a good steamed milk. I am trying to figure out why this is happening but I still don't know why. Is this common for Bellman Steamer? or this can happen with the professional milk steamer? What is the way to solve this problem? Thank you.