It's strange that they are all from LBR script file
By working on bodyconv.def i managed to get those monsters working properly,
But it's not a good solution, they override other monsters.
The interesting thing is that if we put a working monster ,like an ogre , on the "slot" of not working monsters, the ogre will not attack!
The common point of the not working monsters is that they are assigned to a chardef animId > 400 in anim1.mul
But i don't think it's a client bug, it will be strange!
In few words, the animations from different anim muls are fine, i think that Sphere doesn't handle in a good way the assigned slot from animx to anim1 with a id > 400 ( and high detail creature type)