Roll-in, Roll-in, Roll-in

I don't know if other curvy girls like me have noticed this phenomenon.  In fact this phenomenon has turned from curious to down right annoying. What I'm talking about is my shorts rolling up on my inner thigh.
I don't know if this is a curvy girl problem, a running shorts problem or what. I only wear shorts when I'm running/working out so that's when I notice it. It'so frustrating though! It seems like it always happens at the worse time: in the middle of a workout,  when you run into a friend on the trails, pass a cute guy-that's when it strikes.
Please tell me I'm not alone in dealing with this irritation. Will it ever go away!?