This is pretty annoying. Mine was set up like this when I first bought it. You should be able to flip the functions so that the other things are tied to fn, and refresh as just f5, though. Just look for instructions on google or something for your model laptop.
--
YES! YES! YES! YES! YES! YES! YES! I'm the WORLD HEAVYWEIGHT CHAMPION.
Call me a role model, okay?! I'm a VEGAN.