Printed wrong date on my green card

I also got my green card last week wiht the same mistake. According to the card. I became Resident since 04-2000 (the day I arrived to the US), Instead of the day I got approved the adjustment of status on 05-2008. However, the expiration date is on 05-2018, so they are using the approved date to add the 10 years of expiration.
Definilly is a typo mistake. ANy ideaS?
It's not a mistake if you had a refugee or other protected status. In that case your arrival date is when you became resident. I had the same confusion
 
Top