Rhonda Shear bra does it curl up at back fact or under

All her bras that I have bought roll up! Tried several styles and they all have rolled up. I

Watching the presentations it seems as tho often they are in fact riding up or folding over, cutting in or just plain not overly comfy.

I bought them and sent them back, I had to pay to return them. I should have burnt them. The curl up so bad, no support, no quality.