Starter issue '86 GT

[Steve1966v8]

Help! I bought an '86 GT with 5 speed. The car runs and stops great, 69,000 miles. Two times now when I have turned off the key the starter comes on and starts cranking the engine with the key off and in my hand. Put key back in, turn on the ignition, the car starts right up and it is fine. Shut if back off and the starter is cranking again. Let the clutch out and the starter is trying to start the car in gear, push in the clutch and the starter takes off again. Keep popping the clutch and it finally quits. Otherwise it works fine, you have to push in the clutch to engage starter, etc., etc. Appears no one has cut wires or done repairs. Can you help with this wierd issue? I want to drive it!!! Steve