Problems with my Feed in Google Reader

Hi all,
I need some help regarding my websites feed.
I’m testing my feed in Google Reader and also through Live Bookmarks, and in Google Reader I get to see deleted posts and also all my posts have the wrong dates.

When I want to correct an error for example, I edit an old post and leave the timestamp to the original date that was first posted. But that post still appears on top and as new in Google Reader with not the timestamp date but with the date it was last edited. In my feed and Live Bookmarks everything is fine.

I looked allover the web for any answers but no luck.
Can any of you guys help me why I get the wrong dates and also I still see deleted posts in Google Reader?

Thank you for your time,

Loris_