Feed Burner Is Not Updating your Blog Articles - TroubleShoot
Your feed filesize is larger than 512K. You need to reduce its size in order for FeedBurner to process it. Tips for controlling feed file size with Blogger can be found in Tech Tips on FeedBurner Forums, our support site.
to like this
Save the feed details and again go to troubleshootize Tab > Click the Resyn Now button and if you see this successful message like this
You have successfully resynchronized the feed "feed Name"
then your issue is resolved if it is not again reduce your max-results and again try it until your issue is resolved