This is the same problem the link below.
https://bugs.launchpad.net/ubuntu/+source/fluxbox/+bug/146414
I can confirm this bug on gutsy gibbon (7.10)
Tested in 2007-01-10. Problem solved using only
$sudo update-menus
** Also affects: fluxbox (Ubuntu)
Importance: Undecided
Status: New
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Blackbox renders Debian submenu as whole menu
https://bugs.launchpad.net/bugs/122700
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