Why does the Humanoid buggy like this?

Anyone know how to fix this glitching Humanoid? There are no script on the Model. 2 days ago this didn’t happen, but yesterday it happened even though I didn’t add anything. I’ve asked this on this forum before but no one answered.
robloxapp-20220916-2030324.wmv (1,2 MB)

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Maybe the HumanoidRootPart not being anchored?

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I do what you said and this is happen
robloxapp-20220917-1834290.wmv (1,9 MB)

Are there any parts welded to the character? That tends to glitch the character out like this.