The only time I had that happen is when I unlocked/opened the trunk with the key fob and then didn't actually open it, after a time or maybe as I tried to drive away,can't remember exactly, the trunk motor tried to pull the lid closed again but didn't do it all the way and the open indicator stayed on.

__________________
1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)