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Check the wiring at the kill switch on the handle. The switch has to ground the kill wire to kill engine. Wire may be loose or twisted.
Switch is a push button switch, for it to be working in opposite than it should, the cable to it has to be moving in wrong direction. Toro uses many different designs of handles , and can mount witch on either end, but all work the same. Switch has to be grounded to kill engine, so it grounds when you pull handle!
Follow the cable to the switch at the bottom, and see if the lever has flipped over and is moving in opposite direction.