Mower deck adjustment problems

Just purchased a husqvarna z254. I'm trying to level the deck. I did what the manual said. Made the front of the deck 1/8 to 1/2 in lower than the back. However when I lower the deck to the cutting position that adjustment changes. The front of the deck is now higher than the rear. Is that normal or am I doing something wrong?

On a stamped deck you level the blades not the deck and you level it for the cutting height you are going to use.

Thanks for the reply. That's what I ended up doing. However Husqvarna needs to change their owners manual because their instructions don't work.