Some pages reverting to code all of a sudden

[Dopps2k]

All of a sudden some pages on my site that have been fine for years have reverted to showing html code and image attachments. In the editor everything looks fine but on the website it displays all code.

example

http://www.canadiansportsbetting.ca/content.php?9-Bet365-Sportsbook-Review-Canada

not my whole site just a hand full of pages in one particular section. Any thoughts?