This sometimes happens, sometimes doesn't. Which is why it confuses me. I heard it is normal soy milk behavior. But it doesn't behave this way with certain types of coffee.
Most Helpful Guy
Yes! It's normal
Firstly, don’t put the milk in the coffee when it is boiling hot. And if you are heating up the milk first, don’t let it go above 60ºC. Try to avoid using naturally acidic coffees. A lot of African coffees can be acidic.
Next time you buy at the coffee shop ask them to heat up the soy milk or to give an extra cup with it.0
Most Helpful Girl
It looks like the proteins in the milk bind. It may due to temperature or a chemical reavtion with certain fatty oils in coffee.0