Please know that it's not likely that any of us will take the time and energy to try and go through your posts and/or text widgets to locate the problem. You need to act on that.
Sidebars and widgets in them do not fall to the bottom and display below posts and/or posts do not appear in sidebars unless
(1) content has been imported into the blog
(2) the blogger has been copying and pasting content from elsewhere, without using either icon 5 or icon 6 in Row 2 of the visual editor http://en.support.wordpress.com/visual-editor/#pasting-text
(3) or the blogger has copied and pasted invalid HTML into a text widget or left an HTML tag open
After you go here and enable this > Settings > Writing
_ WordPress should correct invalidly nested XHTML automatically
Like raincoaster said above see here for sorting this out > http://wpbtips.wordpress.com/2012/05/19/sidebar-at-the-bottom-and-related-issues/