It is just the geometry of the 3pt and your hog. Play with it until it is in the right holes to get the lift you want. There is the difference of top link holes mentioned by Mr. Gooding but that is just one of many. Not sure about yours, but many tractors have a selection of holes for pins on the near-vertical links that the hydraulic uses to pick up your lower lift arms of the 3 point. (My Kubotas are that way.) I've had tractors where the pins in those vertical links needed to be moved to get proper lift. Also, my 7ft BushHog on a MF 2660 has 2 different locations on the hog where you can put the large pins that connect to the 3pt lift arms -- lower holes and upper holes. If your hog has those you may need to move to using the lower set of bush hog holes to get better lift. Like I said -- just try combos until you get the lift you want. I very much doubt there is anything wrong.