It is supposedly a "helpful" notice (which may not be helpful) , and does not change, or stop your filing of taxes in any way.
________________________
It is likely just a calculation screw-up in the software ...that does not affect your taxes in any way. (a bug introduced in Wed night's update...One TTX Rep said they'll fix that by the end of next week)
Just edit each W-2 you entered, and make sure box 4 is entered to be the same number as on your paper/PDF W-2 from that employer. If box 4 is 6.2% of box 3...then nothing is wrong, and ignore that notice entirely.
(unless box 4 is significantly lower than 6.2% of box 3...then the notice is valid...but it is just a reminder/"Notice" and you can still file without doing anything else)
______________________________________________