I was able to figure it out. Something in my theme’s css was overwriting the submenu (with a float command, somehow?). Thanks for pointing me in the right direction! I may not have ever thought to inspect it.
Here’s a link to the screenshot of what I’m getting: http://arcana7studios.com/wp-content/uploads/Screenshot-250.png.
When I extend the submenu, it overlaps what’s below it but I can’t see the links of the submenu itself. I’m using Chrome on my computer but I also tried Firefox and it does the same thing. It’s weird because I looked on my mobile (both the mobile and desktop versions) and it works fine.