After you file

It says on pg 2 of my 1040a line 46 that I have a  $70 refund.

Line 49 says that I want  $49 applied to my 2017 estimated tax (which I don't).

Line 50 says I owe  $50 and line 51 says my estimated tax penalty is $51.

I can't figure out why and if I'm actually getting a $70 refund or owe $50.

Any ideas?? Thank you!