Samples Disappearing From Pads After Saving?

I added four random drum samples (kick, snare, hat, cymbal) to four pads in my "Program 001," but after I saved and reopened that project those 4 samples aren't assigned to the pads anymore for Program 001, even though the beat still plays exactly how I saved it. I can see the four samples listed together in the piano roll, but not on the pads where they are supposed to be.

Sorry nevermind, I figured it out, it was because I accidentally had them in Pad Bank D.