Steaming milk

First time on this Sub Reddit so not sure if this allowed or not but have been working in a gym with an established cafe, have been working there for a couple months but only make coffees on one day of the week due to only working mornings on the Sunday, anyway part of my job is doing the coffees, I was only really shown how to do it once, and the rest of my ‘experience’ is just from yt and Tik toks, not sure if there was anything wrong that I was doing when I was steaming here,

The main issue I come up against is that when pouring the milk, thinner milk always seems to come out under the foam, while the foam just stays in the jug, even if I’ve swirled the jug loads and tried to make a tornado in the jug or whatever it’s called, but was just hoping to see if anyone had the same issue before or knew how to prevent it? Cheers anyway

(Ignore the start where I turn the knob the wrong way was just a mistake as one way turning it doesn’t lock in place)

Coffee machine is a Gaggia Milano la decisa? If that helps anyone with coming up with a fix or something