As Eddie said its just that you're running too much air in your tires. If you look on the inside of your tires you should see the same line from the dirt as there is on the outside.
With too much air it will push the center of the tire up and not allow the left and right edges to touch the ground. If they are under inflated then you'll see the exact opposite.
To find out what tire pressure you need to run you can do what's called a chalk test. Cover a section of your tire with chalk (see picture) and then drive in a straight line. Keep lowering or raising the pressure until all the chalk is worn off evenly you should be at the correct pressure.
I run about 28psi in my Trail Grapplers
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