John Deere X300 Mowing pattern

I have a John Deere X300 lawnmower. I have the deck set at the highest setting. It Has been leveled. When I cut it digs into the ground. I attached some photos. Any ideas what might be going on?

Attached Images

• 027.JPG (818.8 KB)
• 028.JPG (876.1 KB)
• 029.JPG (930.7 KB)
• 030.JPG (840.5 KB)