Steps:

1. Visit any forum
2. Click on "New Topic" button at the top
3. Default editor loads up where we can create a new topic
4. Type some text in the editor.
5. Click "Preview" button on bottom of the page.

Results:

Expected: Page to reload and show us the preview of the post (located at the top of page)
Actual: Page reloads and it goes directly down to the editor where post is created (at bottom of the page).