Bike seat - starting to be not level on the left hand side??

I think I'm starting to crush the rear of my bike seat on the left hand side. Ie looking at the seat from the rear, the left side seems slightly lower than the right side. My legs are the same length.

Is there a reason why I would be crushing one side? Pelvic alignment, too fat, thoughts?

I was gunna say leg length

Could be like a bazillion things. While not the smartest way to find out, sit your self on the other side on purpose and see what feels wierd and go from there.

Have a close look at the rail and see if it is bending

yes, I think the left rail is bending

Always worth checking that before you start thinking that something is awry with your body.
Apart from the obvious fact that you need to cut out the pies...



(actually it's fairly common and it's a design fault)