Approved I-485 after got stamped.

Hello:

It would appear for whatever reason they believe they may have made a mistake in issuing your residency after approved I-485 and after your passport got stamped while you can theoretically travel. If they decide to revoke your status while you are outside the U.S. you will have trouble coming back into the U.S. You should focus your efforts at this time on responding to any notice they give you as to why their initial decision was the correct decision. You should receive your actual plastic green card usually within two to four weeks of passport stamping. However, it may also take three to four months as well. As the temporary green card is valid for one year, you will definitely receive your plastic green card before that.

Sincerely,

Brian D. Lerner
Attorney at Law
californiaimmigration.us