After you file

Same issue with me.  Original return I opted for electronic debit and got the error when my amendment due was $0.  I changed to mail in check and noticed now I am asked to send in the original payment due via mail.  So does this void my original return to make electronic debit?  I am confused and not sure if IRS will debit or I need to mail in.  Any help from people who resolved this??  Thanks.