Yes. Re: sidebar contents falling and displaying under the posts
This is typically caused by an open HTML tag in one of your posts. And is frequently created by copying and pasting text without using the appropriate icons either 5 ( Paste as Plain Text ) or ( Paste from Word) in Row 2 of the Visual editor to strip extraneous code and insert the remainder into a post. It can also be a result of importing text contained invalid HTML. http://en.support.wordpress.com/visual-editor/#row-2
Go to settings > Writing and select “ ___ WordPress should correct invalidly nested XHTML automatically” and then click “Save Changes.”
Now, starting with your latest post, open it in the editor, make one minor change such as adding a space and then deleting it, and then click “Update Post.” Check your blog and see if it is back to normal. If not, open the next post and do the same thing until it goes back to normal.