Social security withholdings

I have worked for two employers and the program is smart enough to recognize that I have paid more in social security taxes and it would credit the excess amount in my return. I allowed turbo tax to download my W2 directly from the website. When I ran the smart check, the program complains that since I have deferred social security taxes last year, I will get a W-2c from my employer once I have repaid them. Why am I getting this message?