Menu – Incorrect Permalink for Custom Post Type

I am having an issue with some of my menu items.

I have custom post types which have custom permalinks set up for them. They work just fine if you view them from the edit page.

However, in the menu, the link it really screwy.

For example, if I’m on a page https://www.mysite.com/page, and I want to go to my page on https://www.mysite.com/post, the link in the menu will look like:
https://www.mysite.com/page/www.mysite.compost

Any ideas?

I think this just started with 3.1.1 because it was working before, but I can’t confirm because I’ve made changes to the code as well.