Calculations are incorrect

I just copied the income reported on 3 w2’s for one of my clients and the sum as shown on the w2’s does not add to the amount of income shown on the software. The calculation is approximately $2,600 off. No logical reason but to believe that there must be something wrong with your formula - Please give me a give me a call @ 214-300-8756. Moreover I cannot find your telephone number anywhere on your website