Ive seen this issue before. It happens because someone in some post on that page has an additional [/quote] or [/something] which the parser turns into a </sometag> that closes one of the layout's tags. The browser then tries to guess how to give a sense to all the mess by adding the missing tags for the additional close tags. When the page rendering happens the right side bar is moved to the bottom (after the last post), because the CSS now considers the right sidebar alike any other post.

The fix would mean to update the parser to not close tags that don't exist in the post. Something that isn't so easy to do. The manual way to fix it, and much faster is for someone to recheck all the posts by edit -> disable rich-text and delete those additional [/quote] . That's what i used to do.

It also can happen if the "issue" is in some1's signature. Happen before.
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epsinoob

wrote:

Yea, fix that, look on the bottom what I just did