Player save files not saving correctly

None of the things of my minecraft saves, except the world chunks. All of my servers never change, even if I delete them all 100 times they wont go away. When I click on play single player, the first world that it shows on the list in not the one I played last. None of my items, or location on the map are saved. These saving problems happen in the MENU, SINGLEPLAYER and MULTIPLAYER. I have no picture, as I have nothing to show and I cannot make a video clip. Please help!