I second what Paige said below, stay in your 2 point a little longer after the jump rather than immediately going back to your normal position. If you're trying to sit rather than stay in 2 point the second you land, it will be almost impossible not to get bounced around if the horse has a bouncy canter. Wait until you are back into a steady gait, a stride or two after you land, before sitting fully back down in the saddle.
Hey Sam! Try staying over in your 2 point in the stride after landing, I know it may feel weird but staying in that forward, balanced position may help. If your 2 point is weak, spend some time on the flat going around in your two point with and without stirrups :) Hope that helps!
This horse pi. I'm currently riding has a very bouncy canter and when u go to jump him he's great but upon landing even a strong riding will get bounce out of the tack. I'm trying to think of how I can be better on the landing.