Hello, I am sorry you experiencing this problem.
There may be a significantly different leakage owning to the inability to defer stool, the inability to discriminate flatus (gas) from stool and incomplete emptying due to the amount of bowel removed and the location of the anastomosis. May I suggest that you bring this to your physician's attention to see what he feels is causing the problem and what can be done to help you out.
Wish I had a better answer. :)