Lawn mower cuts unevenly Murray lawn tractor 42614a 14hp 42deck?

First of all you might have hit a stump and one of the blades are bent...but if you dont remember doing anything like that, then get a level and place it on your deck and see if its level, if not there should be a way to adjust it, you'll have to take a pin out on one side and lower or raise the deck to the next hole. But id check the blades first