we just bought a new 925 john deere zero turn it is a 54 mod deck. when I put the deck all the way to the lowest setting which Is 1.5 I believe.it still cuts at like 3 inches? anyone ever heard of this.? I want to adjust the deck but I don't want to mess up the pitch and all of the deck. let me know what you guys think. I called my dealer and they said they didn't know what was going on.