Why does my milk do this in the fridge?

I just pumped this yesterday and put it in the fridge.. there’s like a ring that’s stuck to the side of the bottle now. i thought it was good for up to 3 days? Is it ok to give my baby still? I never breastfed or pumped for my first so I’m new to all this. Also having some supply issues so she’s getting breast milk and formula. Thanks ladies❤️

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