Not my first ride with these tires and one completely unseated mid ride. Any ideas of why or how this could happen? Was it something I did wrong?
You’ll need to provide more detail to get useful feedback. What wheels, what tyres, fitted when, by whom, what pressure, what road conditions, …
Did it flat suddenly, or did you notice the tyre go soft gradually? Can you see any damage to the rim - either before it happened, or now?
Road tires burp really easily when underinflated. They also unseat when fully deflated.
So somehow your tire pressure got low and then the road took it the rest of the way.