mpc sometimes pitches up or down a recorded sound, why?

Just like the TT said,
When I sample sounds on my mpc60 and assign the sounds to
the pads, sometimes they play pittched/tuned, while in
sounds/edit/tuning, there's no tuning set. why is this?
Als o when I save a sound, and reload to a pad, it
will sometimes play slightly pitched, why?

I'm not familiar with the MPC60. But when you say you are checking that there is no tuning etc, are you doing this in the TRIM mode? If so, you probably need to check the same things in Program (Parameters) mode.

The problem you're having, under both circumstances you detailed, likely comes back to the program you are loading the sound into (as said above).