I had the same problem and not all lifters had it happen.
it's the push rod ends, they need to be full ball when heavy springs and higher lifts come into play, at least with mopar lifters cause they have cups the are held by snap rings and not only may they not be hard enough they also move around a lil with the lash, but they are also lighter than any other lifter due to this design-19 grams lighter 'each' then a comp or hughes solid lifter.
I have pics of my encounter with it.
the pics show the damage, good compared to bad, the diff in push rod end and a clear view with the naked eye on why/how the push rod can do this.
59* lifter angle puts the push rod at an angle, so it can dig if not a ball end.