[Forum bug] Logging out every time I click the banner or 'Home' button

Title says it all really, clicking on either the banner at the top, the 'Home' button in the top right or the little house icon in the nav bar logs me out and brings me back to the home page, however clicking 'Forums' doesn't. Hence my usual way of getting back is to just go up to the URL bar and delete everything after '.net' and hit enter. I've been having this issue for a while but until recently the banner would work properly for me.

 

Update: It also now happens whenever I click on any links to posts in the shoutbox, the ones like "X posted a new thread in Z: Y"

 

I could report the same problem, but i fixed it by checking the "stay logged" box, when logging in.

 

Thing that bugs me is that I have checked that box too, but the problem persists.