Synced photos resulted in showing photos which were not viewed by my phone

I recently synced my iphone to my laptop and did iphone data recovery, many of the pictures which were on my phone were restored but my problem is that I also had unknown pictures which were never saved or even viewed by my phone show on the data recovery page?! How can this be possible? I sometimes use a second apple ID on iTunes on the same laptop. Could that be a reason? Or could it be a recovery error? Otherwise how could I possibly get those pictures on my phone?