Did you fill in both previous value and corrected value, and they are different?
How to file W2C
https://www.halfpricesof...ut_file_w2c_irs_form.asp Boxes 1 through 20. For the items you are changing, enter under “Previously reported” the amount reported on the original Form W-2. Enter under “Correct information” the correct amount. Do not make an entry in any of these boxes unless you are making a change. If you do not enter the correct amount for one field, ezW2Correction software will leave that field blank when printing form.
Do you need to correct #5 field? If yes, you need to enter previous value and correct value. If not, you can leave both values blank.
IRS W2C W3C Form Guide
https://www.irs.gov/pub/irs-pdf/iw2w3.pdf Boxes 1 through 20. For the items you are changing, enter under “Previously reported” the amount reported on the original Form W-2. Enter under “Correct information” the correct amount. Do not make an entry in any of these boxes unless you are making a change.