Singular and plural wording in post types is reversed

Hello, I’m having a strange problem where the singular and plural of only two of my post types are reversed. The two are Page/Pages and Doc/Docs (which is the BetterDocs plugin). Everything else is fine. I’ve searched everywhere and haven’t found a single post on this issue. This started before BetterDocs was installed, so I don’t think it is the cause.

I link to a Screenshot of my +Add New Menu. It seems like this menu is the only place where this is happening. The singular and plural display correctly in other menus and admin pages. This isn’t a severe problem, but it’s annoying and I don’t want it to spread. Any ideas where I could start in my search for the culprit?

Thanks,
Beth