Use of filters results in no results on theme

hi all,

I've just noticed a weirdness on the Social theme.

When viewing the users/groups list and if you use the 'Order by...' filter to change the ordering, the whole list disappears.

The same happens when viewing the feed and using the 'show' filter

You can check it here: http://community.tabletopgamingcentral.com/groups/

That's a child theme with some changes but I have also checked on the parent theme and same is happening.

Thanks!
Gavin