I find that if I don't change the bag for about 5 days then I can start smelling the odour through the bag but not until then and only if I've been eating quite potent food. I just make sure I change my bag every 4 days and I use a two piece system so can change the bag without having to do wafer at same time.
Are you sure other people can smell the odour as sometimes we can become a bit paranoid and think it smells when actually it doesn't. Ask a family member or close friend to tell you if they can smell it. If not then don't worry, if they can then have to say I'm stumped as to what answer is. I use convatec natura two piece with a mouldable wafer. Do you have a stoma nurse you could ask for advice, there should be one located in the hospital where you had your surgery.
Crohn's dx 1989, loop ileo 1992, end ileo 1992. Arthritis developed 1990 Stoma abcess 1995. Azathioprine started 1995. Panprocolorectomy 1999. Stillbirth 2000, antiphospholipid syndrome dx 2000. Flare up 2004, stoma abcess and strictoplasty 2004. Low blood pressure dx with impaired kidney function 2006, fludrocortisone pres. flare up 2010, azathioprine, codeine, immodium, simethicone.