A lot of people have been having issues with the quote feature, where it remembers a previous quote and you can't get rid of it in your next post. I think Andy said this isn't a bug, but a feature that allows you to come back to an unfinished post and complete it later.
Unfortunately it has the effect of leaving quotes in when you don't want them.
There's an easy way to 'clear' the history of a post before you start a new one to avoid it.
Before you start a new post, if there's a legacy quote in there you don't want, click the 'source' button in the post editing tools. Highlight everything in there and delete it. This will delete all the legacy code from your previously saved post, letting you start fresh.