When I had the external bag, I was eating lots of well cooked spinach. Not all of it went into the loop ileostomy into the external bag. Some of it bypassed it altogether and came out through the (not yet connected) j pouch and came out like stool. My surgeon said this was possible. I guess if the food is slippery or very soft, as my spinach was, it will think it should come out like poop. I took it as a good sign that my new j pouch was ready and willing, and all that was left was the reversal. I hope it's the same for you.