deductions don't reduce your taxes $ for $ at the highest tax brackets at the highest tax bracket about 40% at the lowest only 10%
we can't see your returns so you may want to download 1040 instructions to see if your taxes appear correct.
https://www.irs.gov/pub/irs-pdf/i1040gi.pdf
look for your taxable income starting on page 63
there could be many resons why the amount you find differs from your return.
