Why do some protein drinks get thick and foamy?

So, I am now using almond milk and tried some new protein powders.  They get thick and kind of foamy?  Why is that?  Is it the almond milk or is there some ingredient in some powders that make them get thick?  I really can't stand that consistency!

I'm not sure why.  I tried making a blender drink with a protein shake once and it was like drinking pure foam.  Nasty.

Maybe that is it.  I started using a bullet blender instead of the blender bottle maybe it is the blender process. 

 I usually just stir or shake mine. I don't like the frothiness I get when I use the blender.