Mac problem….please help!

When I post a message and the page reloads itself, it always took me back to my message. Now it has been going to the top of the page instead. I noticed it also happened on another Forumotion forum I am a member of. But now I have realized it only happens on my iMac, and not on my PC. Please, does anyone have any idea how to fix this, it is driving me crazy!