WordPress automatically changing post elements in Edit Page mode

I am experiencing a weird glitch. When I go into the Edit Post of any of my posts (all of which are drafts right now) I can see the correct headline for a second, then they all change to the headline of a post I have – 7 Songs for Testing speakers. I have disabled all plugins, but before I did I noticed that it also switched the info I’d put in the Yost SEO plugin to that for the 7 Songs/Speakers post. However, the body copy for each post remains the original and correct body copy. This happens with all my posts.

I checked the revisions of the posts to see if it would help to revert to an earlier version of the post, but all the versions, even the current ones show the correct copy.

This happened in both Chrome and Safari, so it isn’t a browser issue.

Something else I noticed, this same headline keeps popping up on the Dashboard page under the Quick Draft tab, even though I’ve erased it several times. This one really has me stumped!