Can an employer deduct from your federal and state tax withholdings?

I recently did my taxes and found my federal and state withholdings completely different than what I had paid into during the 2019 tax year.  I left that company in November for greener pastures. I did not have pay stubs from November but I did from October. The federal withholding and state withholding was vastly different on my pay stubs than my W-2. I asked for my November pay stubs and low and behold I saw a subtraction from my tax withholdings. How is this possible without my written consent?!