When on my mobile, not app, just using Chrome or in-built browser to view HUKD. I start on all topics to view deals, then if I go into an item and use the back button everything is fine.
But if I press hot or discussed etc rather than the back button it changes the current topic to that of the item I viewed, rather than going back to all topics.
Also I notice that all the previous dates are coming up as 2015, ie posts made in December 2014 are listed as December 2015, probably previous months too but I've only looked at posts from December as it was a few days ago. I've only noticed this on the mobile phone as above.