Residual poop?

Hi moms! I have a problem with my son where sometimes after he poops it kinda keeps coming out when you wipe even after we’ve cleaned him up well. For example, we change his diaper and wipe him good/apply cream but when we change the next diaper (pee) and I wipe him a little bit of poop comes out. It causes his butt to get irritated. Is he just sharting? Lol