After you file

@Chefkowboy - 

suggest going back into the software and review that you entered $1400 and not zero..... (memories sometimes fail the reality)

 

the math on Line 30 is quite simple: 1400 times the number of people on the return less what you entered that you already received.

 

also, if you did in deed receive the $1400, then you are not entitled to more, that is why the IRS adjusted your return...Line 30 was supposed to be zero.