I also have the exact same problem. I took in my midsection measurement by 1/4 inch because I previously had too much excess fabric billowing out at the sides. With that adjustment the shirt fits perfectly and still has a little excess fabric on the sides which feels comfortable, but I also have that bump just above the belt like shown in your picture. Any idea how to solve that issue? I've read on the PC site that a shirt can ride up if the midsection is too tight/fitted, however my shirt still has excess fabric so I'm not sure what's causing it.