New Posts Icons not working

Hi there, 

Over on my new forum: http://notthenowgamerforum.forumotion.co.uk/

Both myself and several of the users are noticing that the New Post Icons are not working in both the Classic and Mobile versions of the forum.

All posts regardless of when they are updated are showing the No New Posts icon instead of updating according to new posts for the user.

Clearing browsing data, caches and cookies seemed to solve the problem for me briefly but now it is back and it is making the forum hard to read in a logical way. It looks like the is no activity when in fact there is loads of activity.

thanks for the help in advance, cheers!