Apollo recently started doing this the last 3 times I rode him. Its driving me crazy. I will be on the mounting block and he will take a step back. I hop down and back him up a few steps and tell him to stand. This will happen 2 or 3 times and I will finally be able to put my foot in the stirrup without him backing up...then when he feels my weight in the stirrup when I get on he will walk off before I can even get my other stirrup. I immediately stop him and back him up again and have him stand then walk on when I ask.
Today he did the same thing except started trotting off (which is weird because I usually have to get after him a bit to get him to trot)...I pulled my right rein and made him go in small circles until he came to a stop and made him back up. We walked and trotted a couple laps, practiced stopping and backing and then got off and then back on and he walked off again...it is driving me crazy.
How would you go about training him to stand while/after being mounted.