How do I fix Roblox humanoids from glitching

So I’m trying to make a Roblox npc that just sits but when I’m testing it it just breaks what do I do? (The arms and torso work but the rest is non functional.)

Is the head anchored? Is it correctly welded to the torso?

Yes but its still not working idk what i did wrong

Are you sure everything in the rig is unanchored?

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I watched a tutorial and followed every step