I think your position needs a little more work before you continue jumping. Your arms are definitely stiff, not enough bend in the elbow, and you also looked tense in your back and shoulders. Take a few deep breaths, loosen up a bit, maybe do some stretches before getting on your horse. You look like you are forcing your body's motion instead of naturally following the horse's movement. I notice it especially at the canter which may be part of the reason she's started to act up. I'm sure that someone else on here can describe it better, but instead of just lightly scooping into the saddle, and following your horse's motion in a nice smooth move, you are kind of tucking your butt underneath you, and forcing your hips forward, then part of the time you tense up again, and start bouncing pretty hard. Your lower leg also moves a lot, and is too far forward needs to be brought back underneath you more which will help with the forcing your body to follow the motion. You are looking up and not down at the horse which is awesome, nor are you messing with the reins too much. She looks like a very cute horse, and you guys look like you fit together very nicely. I like the amount of weight she has on her, and she's got a kind eye. I think that if you fix your position, that you will find that you two get along much better. I still tend to stick my leg out in front of me sometimes, and I've been riding for over 17 years, and I also lean too far foward. Constantly getting corrected about that ;). I'm glad that you have gotten on the forum and asked for opinions on your riding so you can further your knowledge. There are others on here though that can definitely critique a rider and explain things better than I can.