Chrome - Backspace to previous paragraph adds <span> with undesired style.

This is reproducable on the CKEditor Demo page: http://ckeditor.com/demo . It only happens in Chrome as far as I can tell - Firefox and Safari don't exhibit this behavior.

Steps to reproduce:

1. Place cursor at the beginning of any paragraph.
2. Press the "Backspace" key, which should bring the entire paragraph up and join it with the previous paragraph.
3. View editor source - an inline <span> tag has been added where the cursor is.
4. Toggle off Source, and then toggle it back on - <span> tag is gone.

If someone were to save the article without viewing the source, there would then be a <span> tag with some extra, undesired styles in the body of the post.