Your tool is not changing the deduction when married.
Standard Deduction. The standard deduction amounts for 2018 - absent reform - are $6,500 for individuals, $9,550 for heads of households (HOH), and $13,000 for married couples filing jointly.
Under the House bill, the standard deduction would increase to $12,200 for individuals, $18,300 for heads of household (HOH), and $24,400 for married couples filing jointly.
Under the Senate bill, the standard deduction would increase to $12,000 for individuals, $18,000 for heads of household (HOH), and $24,000 for married couples filing jointly.
Your tool is not changing the deduction when married.
from https://www.forbes.com/sites/kellyphillipserb/2017/12/03/from-tax-rates-to-deductions-comparing-the-house-senate-bills-to-current-law/#3a03f25173b0
But you appear to have a static value for deductions: https://github.com/brockwhittaker/House-Senate-Tax-Bills/blob/7bbff77ae6aabb3d163b40ed2ccb64b568d3ce03/static/js/taxes.js