Why is my taxable sales different than total sales in reports?

Overview

Looking at my reports the Total Taxable Sales is different than Total Sales. 

Environment

Avalara Avatax

Resolution

•  On our report is we have a field for:
  • Total Sales 
  • Total Exempt/Non-Taxable Salea
  • Total Taxable Sales 
• The Total Sales is the Total Taxable +/- Total Exempt/Non-Taxable Sales