When output SSRS report to Excel, Plus sign was moved to the far left pane in Excel. How to fix it?

Hi there:

   I've created a SSRS report and looks good inside Report Manager, See below . plus "+" is in the right place and

if I click it, it will expand. 

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However, when I output results into excel, it becomes this, notice those plus sign "+" have been shifted to the far left and they are

not line up with each month either... Is there any way to fix in the excel so that users could see exactly what they see in the Report Manger? 

 Thanks

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--Currently using Reporting Service 2000; Visual Studio .NET 2003; Visual Source Safe SSIS 2008 SSAS 2008, SVN --