Side Bar not working correctly

I'm not sure if it happened with an update or what, but suddenly my page layout is messed up. I had the default layout as 'content, primary sidebar' and all my widgets showed up correctly. Now the widgets are at the very bottom of the sidebar, after all the content excerpts on my home page and after the content/comments on my posts. I'm not sure what to do to fix the problem. I have never messed with the code because I don't really understand it. Please help!