Blog confusion?!

I'm so confused! Over the past few months, I have been checking my blog with Firefox & I really like it, but lately when I go to view it-everything is disconbobulated (that's a "Scott" word, but it sure is fun to use!) Things are not where they should be & the posts are streeeched out. I don't like it & I thought that maybe I had done something wrong, but really had no clue what it could be. So I opened up Internet Explorer & checked the blog-everything was just as it should be-but it was still crazy in Firefox. Whaaaaaat is going on here????? I have no idea, but if anyone could clue me in on what I am missing-I'd love to be educated!