Get your taxes done using TurboTax

This answer is way off from the question being asked.  I'm not asking about my filing status on my taxes.  I'm asking about the filing status on my W-4.  TurboTax asked if I'd like to update my W-4.  In doing so, it changed my W-4 filing status from "married filing jointly" to "single."  There's no explanation of why it would do this or why I should file as a "single" even though I'm married.  Which leads me to wonder if I should submit this new W-4 that TurboTax has created to my employer, or if it will completely mess-up the withholdings for the remainder of this year; or if I should just leave everything alone.