2021 Federal Amended Return - Amount Due or Not

On the;
1.  "File by Mail Instructions . . . " the last line says/shows "No Refund or Amount Due".

2.  On page 1 of form 1040-X, line 16 shows $629, line 22 shows $0 "refunded to you".

3.  On page 2 of form 1040-V (I have no page 1 of form 1040-V) is a payment voucher with $629.

 

I'm confused. Both lines 1 & 2 indicate $0 is to be refunded or due while the 1040-V shows the amount of payment as $629.  What do I do?