I have animated skinned mesh attached to a camera as a child. When my camera moves further than 20000 units along any axis the skinned mesh starts glitching and jittering. The further i go from 0,0,0 point of the scene the stronger this jittering up to a crazy distortion. It happens with a skinned mesh only while static meshes are ok.
That’s just a fact of numerical precision.
In webGL you’re limited to 32 bit float precision.
Try scaling your whole scene down.
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Correct scale ratio of the entire scene and the mesh helped. 
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