Escaped ID tags in html

In my content I’m giving my <h3> tags id’s for the sake of direct linking. For example:

<h3 id="h3-title">H3 Title</h3>

And I would link to it like this:

<a href="http://example.com/page#h3-title">H3 Title</a>

However, the double quotes are getting escaped somehow, with the results looking like this:
<h3 id="\"h3-title"\">H3 Title</h3>

This makes the links not work 🙁

I’ve tried numerous things, such as removing the wptexturize filter from the_content and turning off magic quotes in PHP. They were off, but I added the directive to PHP.INI just in case.

I’m seriously considering just creating a filter to remove the slashes, but it seems that they shouldn’t have been added to begin with. They’re not added to images, for example, so they must be added somewhere. This happens in both visual and html modes.

Any help would be greatly appreciated.