I would be doing a bunch of work on the flat with him to get him more collected. He seems to be launching over the fences - not really jumping. There isn't really too much arc in his jump. Transitions, transitions, transitions. Walk halt, walk trot, trot canter, trot halt, walk canter, etc.. All done perfectly and repeated until they are perfect. And in the walk trot and canter work on lengthening and shortening the strides - holding the shortening for a max of 6 strides and the lengthening for a max of 6 strides but really shortening and lengthening, using transitions up and down to correct the responses.
Over fences, I would not do any single jumps for a while - keep his attention, make him think. Rollbacks, combinations, poles in lines, jumps on turns etc..
He seems to just be ignoring the rider, when a horse is focused on other things it is a sign that they are bored and feel absolutely no compulsion to listen to the rider - with some horses this can end up in disaster but with most it just ends up in an inattentive, hard to train horse. You are lucky this one likes jumping or he would be refusing.