I am guessing that your are actually all reconnected other than an ostomy to catch the waste, correct?
Some stomas tend to be different than others, actually, and our bodies are all different. When my ET nurse said that I could possibly still have bowel movements I was terrified because, well, what was the point of the surgery of I was still going to have to suffer the pain of using the rest room.
I, too, still have colitis in my rectum and I pass a lot of mucus. This is probably my own doing as, like every normal human, I wanted a break. After my surgery I took medication for a while but saw no improvement so I decided I give my body a break from all of the chemicals.
Now, if I try to push the mucus out I tend to get cramping and an uncomfortable feeling. The doctors told me that this is because my body is unsure of what is going on and it knows something is off. I don't blame it. I can push out what isn't there, even if there is urgency.
Anyway, yes, this is normal. Stool can still pass past the stoma and out the rectum normally. Some people do it every week while others can take months or years!
It is painful and I would still bring it up to your doctor, but it's nothing to worry about. If there is blood or any other complications, then yes, there could be something off.
Understand that this is all new and it could take 2-5 years before your body fully adapts to these chances. I've had my ostomy for 10 months and 7 days and I'm still learning too.