This is a years-old problem that has never been addressed. Malik, the Crown Shop variant of Milo Graytail, has a particular part of his model that seems to be fixed at a certain point in space. This point is along his middle back, and it causes Malik to seemingly distort weirdly in certain animations.
Just raising awareness that this is still a thing.
In addition, Caracticus, Birgus Latro's crown shop counterpart, is also still bugged. His blade's hilt rips and tears away during basic animations and the right side of his helmet is smeared across the front of his face - they could both use some texture fixes.