Just like the officer said, you should expect receive a decision which will be either approval notices of your I-130 /I-485, or a notice of intent to deny your petition/application.
Who knows? It sounds like it was an in experienced officer - or one sitting in for another. Sometimes they don't act as we expect. You will have to wait for the decision.
I agree, it might just mean it was a more inexperienced officer who will need to have his supervisor review his decision before issuing it. You can check the case status at uscis.gov to see if it gets updated within the coming days. I wouldn't worry too much for now. Good luck!