PA Tax owed?

Hi, I typically do not owe taxes for PA state tax. I did my wifes portion of her taxes and it looks like it was 0.00, until I entered my W2 portion.. Some items stood out.... I never had to owe taxes for my STATE of PA before.. I owe 306.00.. and I am not sure as to why?

 

BOX 1- 42701.41 

BOX 12A D-1829.18 

BOX 16 44530.59 

BOX 17- 1367.06

BOX 18 44530.59

BOX 19 445.30

 

I see that BOX 12 is D- 1829.18 which seems like PA added that as taxable income? Is that why I am overpaying? Was there an error here?  My wife makes the same as I do and we literally have paid the same amounts of state taxes.. The only difference I see is the an amount that is owed as opposed to ZERO. Please advise!