Uhhh, they are supposed to.
A few months back, a fellow FABO friend and I installed PST UCAs in his 68 Dart. The right UCA was jigged and welded wrong. We could not get it any better than 1 degree NEGative caster! The left side was fine, the right was messed up. The stock UCAs both got 1/2 degree of negative camber and 3 1/2 degrees of POSitive caster so it wasn't a bent strut rod, LCA, damaged mounts....it was the PST arm.
Yeah, he got a refund.