It's interesting that this actually has a name. Funny though, years ago I had this issue with my clubs. I was a long time Titleist Tour Blade player, switched to a Titleist cast iron in my mid 30's and then to a BIg Bertha Callaway. After playing these for a few years, I bought a set of Ping Eye II's and enjoyed playing with them but found that the irons had a super sweet spot in them. Every iron seemed to have it, you would hit it there and it would jump 15 yards. You would strike an 8 iron from 140 yards perfectly and it would fly to the back of the green. Talked to my pro and he said this was something that many of the cast clubs had. Went back to Callaway and never left them, haven't had this issue with my real clubs since. It is frustrating to strike a perfect shot on here or in real life and watch it move 10 yards right, left, long or short.