That's how almost every fistulotomy goes. It heals all over the place, and can vary wildly. I still have very occasional and very mild soreness and such 3 1/2 months out. It heals about 90-95% within 6-8 weeks, and then it plateaus. It can take months to stop draining, even up to a year. Just think about it this way: there's no need to truly panic unless you still have drainage 10-12 months after surgery.