Question about 2002 Toyota Highlander

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Engine running without ignition key

MyV6 highlander has 70,000 miles and never given me a problem in the 10 months I have had it.
The following is the sequence of events-strange.
I left my 10 yr old grandaughter sitting in the parked car with the ign key in the accessory position and radio on. After 10 minutes she left the car and brought me the keys-I was sitting in the shade around a corner about 40 feet away.
After a few minutes she asked what would happen if I pressed the panic button on the remote. I pressed it to show her as we approached the car. However, the horn did not blow and lights did not flash, but when I was 20 ft from the car I heard the condenser fan running, and when I reached the car, realized the the engine was running! I put the key in the ignition, and turned it to accessory position - engine still ran, then turned of the key to lock position - engine still ran. Then I turned to start position which caused the starter pinion to hit the flywheel and then turned back to the off
position. Engine turned off and has been running fine ever since(2 days). Panic device appears to operate normally.
??????? On board computer???????

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