Visual Studio report subtotal

I have a report in visual studio reporting services and I have a subtotal column on a matrix.  The subtotal is simply supposed to be the total of 12 columns that all have a vlue of 1, so the total should be 1.  But it is saying the total is 13.11.  I was just wondering how this subtotal column works, or if there is any way to override it
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Paul MacDonaldDirector, Information SystemsCommented:
It seems to me the subtotal should be 12, not 13, but I wonder if the individual columns are actually displaying values that are rounded to 1.  If that's the case, the subtotal could be correct.

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