seen this a couple of times before – for no explainable reason WP outputs the content.
What happens if you create a new post does that one display correctly?
Please I’m facing the same problem… I think it happens when you changed the post format from standard to any other format.
In my old theme, if I wanted to publish music I select format as music, video i select format as video…
Going through all my published post contents… All those posts showed the whole text content.
I just detected this morning that same error occurred for videos as well… And what if i have other post format like Quote and others that I’ve used in my previous theme? How do we deal with that?