Someone know why the total of my report don't include all the rows of the report

I have a SSRS report with VS2008 and the report contains 4 groups and in the first group have the value that i want show the total at the end, but i have the details of the group, and I've found when the details shows the value don't aggregate at the total.

**Groupheader1** have this expression =FormatNumber(Fields!OpenBalalce.Value,First(Fields!DecimalsGeneral.Value,
"RptParameter"))

Details

GroupHeader1 have this expression&

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