W2 12c W value different from actual HSA contributions

Hi, 

 

My W2 shows 3712.50 in Box 12c Code W.

 

My total HSA contribution has been $7200. Out of which my employer contributed $1500. 

$7200 - $1500 = $5700 has been the employee (myself) contribution. Out of $5700, some amount was deducted outside of my paycheck.

 

When I uploaded my W2 to TurboTax, it did not read any numbers from the Box 12. So I entered those myself. While entering the Box 12c Code W, do I enter what my W2 shows which is 3712.5 or should I enter the full contribution i.e. 7200?

Also, do I have to make my employer send me a corrected W2 or it doesn't matter?