I've been having this problem for a while, I've just managed to work around it. I'm at a point where I can't do that any more. The problem is, when I have 2 menus with the same items, only one will expand properly. For example:

Menu 1: block viewable by super admins

-User
--Add
--Manage
--Delete
-Calendar
--User guide
--setup instrunctions

Menu 2: block viewable by regular admins
-User
--Manage
--Request
-Calendar
--User Guide
--Common issues

Only Menu 1 would expand when I clicked User. Menu 2 (the second one created) would never expand and show the children of "User". I would have to set it default to expanded if I ever wanted to see those children.

Has anyone else seen this issue? Is it because the Title of the items to be expanded are exactly the same?