Heads Up! You have a W2-C coming!

I've entered all our data, double checked the W-2 entries, and then this message about a W2-C comes up in TT 2020.  The screen says "since you deferred some of your Social Security taxes last year, you'll get a W-2c from your employer once you've repaid what you deferred."  There was no Social Security deferral!  I have no idea what TT is referring to.  The W2s show the correct SS tax withheld (6.2%) on the SS wages in box 3.   I have no idea why I'm getting this message.  Anyone have an idea?