So IRS changed my refund..stating something was wrong like incorrect ssn, or name or agi but its not , pulled from last return which was fine. So why did this happen?

[HeatherPLO]

You might have an offset.  For more information on this, please see this Help Article.  

For information specific to your situation, you will need to reach out to the IRS. To do this: 

To call the IRS: 800-829-1040  hours 7 AM - 7 PM local time Mon-Fri

• Listen to each menu before making the selection.
• First choose your language. Press 1 for English.
• Then do NOT choose the first choice re: "Refund", or it will send you to an automated phone line.
• Instead, press 2 for "personal income tax".
• Then press 1 for "form, tax history, or payment".  
• Then press 3 "for all other questions."
• Then press 2 "for all other questions."  It should then transfer you to an agent.

[VolvoGirl]

That is just the list of generic reasons they give if they changed the Recovery rebate credit on line 30.  How much is on 1040 line 30?

Do you have an amount on 1040 line 30 for the Recovery rebate credit?   Did you not get the 3rd Stimulus payments?  Or qualify for more?  Line 30 is only if you qualify for more or missed getting one.

If you claimed a missing stimulus payment on your return but the IRS took it off you have to ask the IRS. They think they already sent it to you. Maybe it went to an account you don't remember. Or you got a check or a card. It was probably easy to miss the debit card in the mail and think it was junk mail. They have to put a trace on it.

Request a trace for a missing third Stimulus payment

https://www.irs.gov/newsroom/questions-and-answers-about-the-third-economic-impact-payment-topic-j-p...