Mesh deform is not working.

Hey guys! I’m rigging a T-rex(Not Finished sculpt) i made in blender. I have all the weight paints correct, but something is wrong. When i move the armature some parts that are assigned with a weight of 1 will sort of elongate or stay slightly in place. This causes the eye and the teeht to move when they infact should not. What can i do?

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I have all the weight paints correct,
Check them again.

Check you have not multiple modifiers, check for any constraints or parenting issues