Blank episode drafts

Sometimes when I create a new episode and save it as a draft, it goes blank. That is, the episode title and episode content show up as blank in the WordPress editor. It previews just fine, but I can’t actually edit the title or content. Additionally, in the editor, the fields below the content look like a standard post rather than a Podlove episode. Yet the “Post Type” is listed as “episode.”

I’m not sure why this happens sometimes and not others.

I did find this warning from PHP:

Warning: number_format() expects parameter 1 to be double, string given in /var/www/ahem/wp-includes/functions.php on line 265

Any advice?