UI Dropdown not displaying the options list when clicked after the first selection

I have a dropdown in a menu that is enabled on a UI button click, this menu has a dropdown with a list of options that gets created at startup. The first time a user clicks the dropdown the options list is displayed as expected and options may be selected. When the user returns to this menu from the main menu and clicks the dropdown again, no options are displayed – however the user can select the location on the screen where the options should be. Once the user clicks the probable location of the 0th element, the user can re-click the dropdown and the options list is displayed normally. . .

Using unity 5.5.0f3

The issue was that my dropdown list was not being destroyed before I returned to the main menu. I fixed it by programatically destroying the Dropdown List child object of my dropdown menu.