So, I'm building a custom theme (this is my 3-4 time doing a custom theme for Concrete5), and something strange is happening to the Redactor Menu when I go to edit a content block. It's as if the overflow:hidden which is added to the html class when the Redactor Menu has a dropdown menu hides my page and moves everything around. I can't figure it out.

See attached pictures.

I've already eliminated all extraneous javascript to make sure it wasn't a java problem, and nothing changes.