I think soreness is from stretching before the concentric movement. That`s why the chest gets sore, the bar goes down on your chest and stretches your chest. Overhead tricep press the tricep stretches. But when curling, your bis don`t stretch (unless doing incline DB curls) Also when doing shoulders, it`s hard to stretch the deltoid. They only get stretched a little when doing Incline bench or something...
This is NOT scientific it`s just my opinion and what I`ve experienced. There are other factors involved, but THOSE things are doing it for me. I actually don`t like getting really sore.