I get what you're saying, huge difference. Without measurements everywhere, I can't really say a lot more than beats the hell out of me, I've had to file standard top rings in a standard bore with 100k on it... that is a mess! Where were the gaps taken at? Same depth? I'm guessing you squared them up with a piston... same location down the bore? I need to go out in the garage and check some junk anyway, but the stuff I stuck back together moons ago was .018 top with it down just below where the top ring "tops out" in the bore and I wanted just a bit more.
No faster than I move, I can probably send you a ring from a set I have here if you want to check it. How big of a hurry are you in? With the drawing I could understand a .06x top gap if you were worn .012 , that's .006 per side, not a lot. You can feel it on the ridge... I have zero idea where a .028 turned into a .06x plus on a replacement set, though. That sounds screwy... push them down to the bottom of the bore and check them again?