Incorrect information line 1a 1040

I submitted my taxes last month and two weeks later I received a letter from the IRS requesting more information. In gathering the information I discovered that TurboTax had inserted line 5 income (Medicare, etc) from my W-2 into line 1a of the 1040. The imported W-2 information looks identical to the W-2 I received from the employer. The 1040 worksheet has the Medicare income listed on line 1 instead of the 1a information.

 

Have been doing my taxes with desktop TurboTax since the early 90s and have never had this happen before.

 

Anyone else have this error, or was it a random occurrence?