Summary BLog not showing recent posts

I have 4 summary blog pages for different topics. I recently changed from 7.0 to 7.1 and 3 of those summary blog pages are working perfectly well. However the 4th one, the Reicpes one, is not picking up most of the posts and is only showing a few older ones. What can I do to make it pick up the recent posts? I have posted recently in the others and they are working fine. thanks.

Have you tried replacing the summary block that isn't working? i.e. creating a new one to see if it'll pull the newest blogs?

Thanks, I have done that now and the only blogs that come through are the 3 recent blogs that don't come through on the other one. Do you know where I need to look to fix this? 

I appreciate your response Ziggy, thankyou. It wasn't the tags or categories- it was the number of posts my new summary page was allowing. I still couldn't fix the old one but the new one is working now.