S.D.
My son was the same way, he did great with peeing, but would not poop, one night he had started to poop on the potty and freaked out, it took me 3 months to get him to sit back on the potty. He also would not stand to pee, that took over a year, not that that is a big deal, but anyway, I would ignore it for the most part, not make a big issue of it, don't let him see it bothers you, eventually he will decide to poop on the potty, give it time. Good luck!!!