If it feels right, it probably is! If you want to get a better feel for when to rise out the saddle and come back into it on landing, talk to your trainer about maybey doing a small jump non-stirrup. It sounds scary but its surprisingly nice to jump non stirrup. Anyways, riding non sturrup means you have to allow the horse to push you out the saddle when he wants you to rise, and you have to come back at the right time on landing otherwise you become unbalanced. You also stay closer to the saddle.
If you don't want to go non-sturrip, try closing your eyes 3-4 strides out so you have to feel when to rise into jump position, and when to sit up again. Obviously do both these exercises on a horse you trust, and while being supervised!
We lose ourselves in the things we love, we find ourselves there too ~Kristen Martz