May be bad shots or bad bullet selections; either will give undesired results. I have a 6.5CM; but I'm not taking a 14# suppressed weapon hunting even with my 143 ELDX ammo. I use a suppressed 7.62x39 AR because I shoot them at typical bow hunting ranges and it is all I need.
Biggest surprise for me is the Meopta brand. I have a couple of Vortex and they have served me well in the field. Biggest disappointment was a Weaver Kaspa that I broke 2 of them on my suppressed LR308. Reticles on 2 different ones started rotating in the tube.