No Blue, You're right the pins are pressed into the rods but it happens when you install the pistons on the rods. It's one operation is what I meant. It just sounds like the rod wasn't sized right for the pin fit or else it became loose from some other action while running.
The KB Hypers have gotten a bad reputation over the years because there is apparently very specific guidelines that must be adhered to for them to live long and prosper. Not like a regular deal where you can buy off the shelf pistons and rings and drop in and go like most of us have done all our lives. If not done exactly to the manufacturers specs mostly the trouble I've heard are the tops above the top ring blow out. I guess the ring groove is closer to the top of the piston than others. Other thing have happened as well but that is the one that I've heard the most about. People that have taken the time and done things correctly have no complaints.