Man your horse stance wasn't a horse stance, the glutes need to be extended a bit and a bunch of other stuff, you also need to work on the actual run.
Your run is the main reason you are having trouble with the other stuff, the jump in the beginning is quite bad, and that makes the rest of the run skew and off centre.
In terms of you trying to jump, I assume you are trying to launch, in that case, you need to extend your hip more and extend the same glute so your leg gets behind you to give you forward momentum. Like in my replay