hmm in that situation it seems that Jann Lee backed far away enough that it whiffed. Also Tina's moonsault may have a different hitbox than Lisa's own (I have no idea, just a thought). It doesn't seem to extend to Lisa's legs from what I saw in the video
It's because you were around a solid object (the little pillar of ice in this case). The DOA gods nerf Lisa's range when she makes contact with solid objects (that's what she said lol??) Seriously though if an opponent does basically anything Lisa's moonsault will whiff or she will otherwise get knocked out of it, and her being around solid objects makes it worse.