Social Security tax withheld

My employer is taking 6.2% of social security wages in box 3 plus taking another 6.2% in box 7 which is tips.

 

I'm trying to convince her that Social Security taxes withhold is only for box 3.  

 

It's showing I overpaid way too much, but she's telling me that her way is right.  I know she's wrong and it's costing me $1300.00 in overpayment.

 

Can someone verify that I am right and she is wrong about this post@

 

Thank you.