Mob Texture

Okay so, I'm making a mob for my dimension and when I spawn it the arms legs and head are disconnected from the torso (which is in the correct place) how might I manage to fix that? I've checked many people's problems with textures but all had to do with a biped model. My creature is custom and not a biped... (Also, I put an animation on it and the only thing bugging me is that the arms are facing upward like it's shocked or something. I'd see that being a problem with my pivot point though.) Please help me this would be greatly appreciated! (Also, Using Blockbench for models)