Fix the latches. The latch has to close over the striker, and if it hasn't been lubed for some time it can stick, ie not actually latch. It also has to be aligned properly to close properly. Finally, if the hood bumper stops are adjusted too high it may not latch completely, yet appear to be closed.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue