Duplicated content

Hi! I created a simple text block to style with CSS, but – in the post – when I select a second block of the same type, it duplicates the content. If I try to edit any of them, the other changes too!

Here a image to illustrate: http://expressojca.com.br/teste/lazy_blocks.jpg

Thanks!

The page I need help with: [log in to see the link]