There's nothing in that snippet of the movies submenu .DATA.xml file that should cause any issues. It's hard to say more with so little to go on, but as you asked where to start looking, the most likely causes are:-
* There's something in the relevant .DATA.xml file which shouldn't be there - if not using templates, potentially in an irrelevant .DATA.xml file, too
* (If not using templates for the submenu) The script is getting the visibility conditions wrong for one or more items (unlikely to lead to them just appearing in one submenu, though)
* (If using templates for the submenu) The script is adding the wrong items to the relevant template (unlikely, though), or the visibility conditions within the template are wrong
* (If overriding actions in particular) One or more overrides are causing unwanted side effects - especially possible if you override anything based on the defaultID (all three items in the snippet have the same defaultID, indicating there is a small possibility there's an issue there)
* Entirely user error/issue with user system
* Something else
Edit:- I'm assuming you've copied that snippet out of his backup. If you restore his backup, do you experience the same issue?