You exported the morphs and applied them to the other figure, didn't you? Do not do that. Copy the deltas and this will not happen. Open the donor and target cr2 in MM4 or MC and copy over the morphs you wish to try. For V2P4 only the head and not a lot else - maybe hands/feet? - are valid. For the Kids - on the torso - morphs that enlarge may have a useful effect, but morphs that go smaller usually deform.