Just updated with a blog post: http://blog.coinbase.com/post/47198421272/data-on-public-merchant-pages
These are merchant checkout pages. Your information is not going to be shown on one of these pages unless you created a "buy now" button, donate button, or checkout page and posted a public link to it somewhere as a merchant. Order pages are designed to be public so customers can reach them, but we messed up by making them publicly indexable and including merchant contact info there without being more explicit. The email in particular should not have been included. More details in the blog post. Very sorry for the trouble on this!
Thanks brian for chiming in.. as a coinbase user myself i echo lukestokes sentiment.
Best,
Zedicus