Members subscriptions don't expire when their membership ends

Hi guys
I have noticed that the members that are meant to expire have not been. One of my users was due to expire yesterday 29 July 2015, but they still have a full member subscription and can access all content (I have left the users account as is, so you can see the issue).

I have enabled access to my site for you to have a look at this issue

Thanks in advance
Ken