Did you get the first 2 Stimulus payments for 1200 and 600? Then it sounds like it got entered on your tax return to give it to you again. Which was wrong. Check 1040 line 30 for the 1800. You already got it so the IRS took it off. They know they already sent it to you.
You should not need to amend. What did you change or enter on the amended return?
