[ossiblue]

Yes, it sounds like the mechanical portion of the switch has failed. The key turns a flat metal pin that fits into a slot in the plastic, electrical portion and it is the electrical part that has the spring loaded resistance to the start position. You turned the key all the way to the right, connecting all circuits of the ignition, then moved to the start position where the pin likely broke. That would cause the start circuit to immediately release, and the electrical switch to spring back to the "running" position--all electrical is on. With the pin broken, turning the key will do nothing and the ignition remains in the "running" position.

The above is not absolutely certain, just my educated guess given your description and my experience with these switches. Removing the entire switch will tell you all you need to know. The mechanical part is expensive, the electrical part relatively cheap.

You can unplug the connector at the rear of the switch to disconnect all electrical and shut it down while you wait to find a replacement mechanical switch. If you can successfully remove just the electrical portion from the back of the switch (it's a PITA but doable) you can just plug that into the wiring and start your car with a flat blade screw driver.