League Of Legends Major Client Glitch/Bug

For some reason whenever I click on "Runes", "Champions", "Masteries" and so, on the League Client, its always messed up in a way. Whenever I click on "Champions" for some reason I only see the Nunu icon and can only select him. Also, below Nunu are a bunch of names piled up each other. When I click on "Runes" the runes are all scattered around the client and are huge for some reason. Whenever I click on "Masteries" the descriptions of each mastery are hiding in a corner or something and are not where they are suppose to be. So if this could be fixed, I would be very happy :)