Question

I have an older sony a4 receiver that i had my from previous setup. When i got my directv installed at my apt i noticed that the channels numbers were not the channel on my sony a4 that is on my hd dvr. Ex my local channels are 06-33 on my hd dvr and on my sony a4 he local channels are 900 hunndered. Is thier a soultion or epanation to why this might be