Incorrect AutoFilled Information

Hello!!

 

I am filing late for my 2016 taxes due to not receiving my W2 and going through HOOPS to get it. I saw that turbo tax had already autofilled most of the information. But they had numbers in boxes 16 and 17, where my W2 had them blank. I am confused because my other W2s had information in these boxes as well.

When I deleted the boxes, my return drops substantially. This is surprising because I expected a large return that year due to having the most deducted possible from each paycheck from both jobs & I don't know why such a small paycheck (I worked there for a month and a half) would affect my return so much..?
My question is: where did TurboTax get this information from that I do not have and should I turn it in with the autofilled numbers or leave them blank?

 

Thank you!