Post excerpts suddenly only show full post

Hi,

On our site some of the excerpts have suddenly changed to show the full post in the last week or so. The main category pages and the homepage our fine but in other areas such as our mobile site (access via a smartphone) and at http://liverpoolstudentmedia.com/guardianopenweekend the posts are now showing in their entirety.

I’m not sure what has happened to cause this random change.

Thanks.