Solid rollers with off set push rod hole issue.

First thing I would check: does the offset on the lifter line up with the side of the lobe that is damaged. If so, that could point to edge loading. That can be made worse by the lifter being loose[r] in the bore ; also the roller having too much play in the brgs [ or bush ]. All of these variations in tolerance could stack up the wrong way to load just one side of the lobe. Instead of the load on the lobe being apportioned across the full 3/8" width of the roller, the load is being concentrated on a narrower, one sided, portion of the roller.