Issues going back 1 page on TD

I'm not sure why but recently when I click on a thread and then decide to go back to the board, sometimes I have to click 2 maybe even 3 times for it to go back. I'm using firefox and when you click and hold the back button sometimes it will show you have to go back 2 or 3 pages even if you are on the 1st page of the thread. Anyone else have issues with this or a resolution?