Why does the forum reload itself?

Why does the forum reload itself to the index page when I visit it (even if I'm on the index page). Sometimes it does it multiple times. If I bookmark a subforum and visit it, it reloads to the index page. If I bookmark the index page, it reloads as well.

Does it do this for anyone else?

Yes it does this when I'm on my laptop. The settings etc, however, are exactly the same as on PC. I have no clue why, unfortunately. It's also greatly disturbing me (sometimes).

I have been having the same problem when I log in from work which recently updated/increased their spam and malware protections.