- Edited
That’s normally a sign the wand is too deep in the milk as it’s injecting huge bubbles.
Try starting the wand sitting on the surface of the milk, almost not touching.
Also be sure to purge properly before, you see cafes just blast the wand for a split second but on a home machine that won’t purge enough and you’ll get spitting which can also cause the milk to rise instantly.
Purge til the steam is constant and not spitting at all, then steam quickly after.