pitch problem when connect with midi key

when i connect my midi keyboard pitch of samples in mpc are changing, i can't bring them back, when i go to program pitch is same as it was but it sounds different, how to fix it??

U sure u set the right midi note assignments?

is it that they sound a semitone to high or low when you play them over your midi-keyboard?
I had a similar problem, i just changed the pitch of the midi-keyboard so that the pitch of the sounding sample fit to the key i press...

i think its something with pitch wheel or someting, like play same sample with same pad but i have different pitch then before turn on keyboard, and cant go back have to reset mpc and load program again, it is shit when i forget to save program before connect to mpc, but its happen with any other stuff that is conected to mpc like i have s900 connected to mpc and when i turn on that key and when actual program in mpc have midi out to s900, then s900 is changing pitch as well