Injection code appears above header?

Hi, I'm trying to use code injection with CSS code for a single page to change a font for an item on that page. When I add the code through the page's Settings/Advanced and save it, the actual code appears in a white area above the existing banner, on both the configuration site and the live site. Template is Bedford, and supposedly my site was grandfathered in to allow code injection. (I've since removed the code.) Thanks.

If you add code via Code injection, you got to wrap it in html tags like so 

<style>
	/* Paste your snippet here */
</style>