That is the difference I saw also. I have without realizing it always maxed out the stripes of my heroes to which ever skill level they are at. It’s why I don’t PvP with my Plats that often. I working to get them evened out. My PvP runs start out with matchups against lower power squads -most of the time. Then I’ll get a few high ones. After that it settles in with +/-500. What’s weird is that I’ll lose to the underpowered squads after 3 or 4 crates.