Likely, the hub and shaft are either splined together with tapered splines or tapered and keyed together.
They have worn and when you took up the slack the hub probably jammed against the bearing cover at the end of the gearbox that holds the oil/grease seal.
NOT good.
You need to take it apart and determine if that's what's happening and replace parts as needed to tightened up the mechanical joint and keep the hub of the "jumper" away from the bearing cover/seal holder.
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