Granted green card trough asylum, question about 8 CFR 209.2 law about grating one year backdated from approval of greencard

My father was granted asylum that's how i got asylum too, i enter in the us in 2005. in january 2009 i applied for adjustmen of status got approved in june 2009 got my green card on that month category on card is AS8 card has resident since 6/8/2008. Back on 2010 I thought that card had a printing error on resident since date, so i sent the card back with i-90 form 10 months later got a new card but had the same date as resident since 2008 did the 8 CFR 209.2 apply to me? Is that why my residency date is 2008 and not 2009 the year that was approved