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Does anyone else's steel cut oatmeal. . . .

No. Definitely odd. Would suspect the oats are spoiled or something.
That doesn't sound right at all.

Are you preparing them in the same place or container you do your greens powder if you take any?
Tiny bit of greenish froth, I see the same thing. I use Bob's Red Mill Steel Cut Oats, but I *think* I've seen this with others as well. I've only seen this when I prepare the oats the night before -- I boil the water, take the pot off the heat, then dump in the oats. A bit later I'll see the strange colored foam, then it's gone in the morning.
I make it in a pot which I only use for oats and ww pasta