Your “standard deduction” doubled (and this is how they confused the public).
You used to have standard deduction (which is what you deduct IF you do not itemize your deductions) AND a personal exemption.
The personal exemption of over 4k per person, this effectively lowered the total of your “taxable income” by exempting some of it off the top.
Without that exemption, the amount of your paycheck that is now eligible to be taxed is higher by over 4k per person. So if last year, a family of 2 had 90k in taxable income, ie not exempt, than this year all other things remaining the same, you have a taxable income of 98k.