Here’s the link to the website with which we’re having problems. If you hover over the “Programs” dropdown, move your cursor down to the second or third item and then to the left so it’s hovering over the padding surrounding the ul element, you will notice that the next menu depth will disappear. It does not appear to be related to any customizations we’ve done because a clean theme install on test site behaves the same way. WordPress version is 4.7.1, and we’re running X version 4.6.4