Raw C Protein and Cacao

I had this Raw C Protein and Cacao drink after a workout when I didn't have a protein shake on hand. I liked the fact this uses pea protein rather than whey, but even though I shook it before drinking, a large chunk of clumped powder remained in the bottle even after I drank the liquid. I am not sure if I didn't shake it enough or whether this is what happens when you buy a natural and organic product.