High squat mobility, poor control. This is more common in females, but also in males who've played sports that demand extra mobility as a kid, or who have a lot of congenital joint laxity.
For these people, they need to focus on trying to control the movement more, which means slowing down and thinking about positioning and trying not to bounce through the movement.
In four months I'll be a whopping 28 years old. I know a thing or two about training and all that goes into it, but I also respect the fact that there's a hell of a lot I don't know enough about, and other topics I need to know something about that I'm not even aware of!