Hidden Data cleanliness issue led to basic average in Spotfire not giving the same answer as in Excel

I am calculating a simple average in Spotfire across a column that is a REAL column in Spotfire which comes from a % column in excel .

I have values across the 12 months of the year for multiple groups. The Spotfire report will be run for a user selected month out of the year for all the groups.

When I compare the results of the Avg() function in Spotfire to the average for the Average() in Excel for a representative set of data, January, I do not get the same results in Excel and Spotfire.

However when I export the data from Spotfire and bring it into excel, the excel Average() of the exported data now shows the Excel results not the Spotfire result. 

I am confused Why am I getting different results in excel and spotfire? I need to understand because my stakeholder will "validate" the results of the Spotfire reports by using excel. They will be very confused when the results are not the same!

Attached:

Excel file showing raw data and exported Spotfire data side by side with Average() calculated.

Screenshot of Spotfire Avg() function defined for report.

Screenshot of Spotfire Avg() results in report.

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