Did you add anything like "+1" in there did you? If you hover over the results you will see a "++0" coming from somewhere. I don't use that section of the sheet so am idly digging around at no o'clock in the morning. But in doing so I discovered this: When I put a value in the Base Attack box the sheet began working correctly - at least not just giving zeros. As you can see I just put a zero into that box and it began working correctly. Not the best roll, and I did not add anything in there to do damage - just put a zero in the Base Attack box. Hope this helps.