Is it normal that my skirt stinks like sour milk?

Im not sure but mine does too

Let it dry before re washing it. And add some disinfectant into the wash nothing with bleach in it though it will ruin your skirt

That's so random I don't even know what to say

Maybe ur sweat and the skirt don’t mix well

The fabric is probably rotten. Its best to just throw it out.

burn it