a bug for everytime i go into the store to get champions or skins

every time i go into the store it takes me to featured as it should but if i click on another tab champions/skins/bundles/etc it says time session expired then takes me back to featured quickly. server NA. is this happening to other people, i don't know i tried repair and then went to store it did the same thing. if anyone had this happen and fixed it can you tell me how and i'm also using a mac