I’m having the same problem. Take a look at the opening comments of content-types-wordpress-plugin.php, it looks like there are extra line breaks between each line, which may disrupt the parser that pulls out the version number, etc. If you don’t see the extra breaks when you develop locally, you may have to play with the settings in your text editor; specifically, Unix line breaks vs Mac or Windows ones, but possibly other settings also.
If that doesn’t work, compare your comments against the example in the Codex and the file header specification to see if you notice any minor differences.