My mower blades will not stay in position. I lined them all up for maximum descharge, then off I go to mow. Now mind you everything was wet after three days of rain. I hear two blades underneath making that noise they make when the air flows against itself when the blade are out of alignment. So I stop, clean the deck and reposition the blades. I chalked this incident up to the heavy wet grass. OK. Go back to shop, service the mower, sharpen blades, clean deck and realign the blades. Now everything is dry. As soon as I engage the pto, the blades move out of alignment. I check the belt, and it feels kinda glazed. So I hit it with light sandpaper and used some belt dressing. Now the belt feels real grippy, but the same thing is happening. Do the blades always do this and I just never noticed this before, or should they stay where I put them??. I dont think I am going crazy, and think they should stay put. The biggest problem is when the blades move, then the deck does not discharge as efficiently as it should. WTF am I missing?? This is drving me nuts. Any ideas, solutions???