Charitable deduction

I entered $600 as a chartable deduction through the Deductions and Credits page.  When I finished that entry and went back to the main page, it shows my Charitable Deduction as ($2,065)  If I take my $600 deduction out, it shows as ($2,665).  I have no idea where that number is coming from and I can't get rid of it.  What's going on?