Panel menus drop-down from different spot

Assume I have Firefox open and maximized:

1.) If I press F10, the "File" menu gains focus. If I press left-arrow-key, then the Indicator-Session (Power-Cog) gains focus. If I now press the right-arrow-key, the File-Menu's drop-down appears in the middle of the panel (i.e., it does not appear under the "File" designator). Please see attached screenshot.

2.) a similar thing happens if I try to move from the Messaging-Indicator to the "Help-menu": I press F10 and move focus to the Messaging-Indicator. If I then press the left-arrow-key, a drop-down menu of Firefox's Help menu appears under the Messaging-Indicator. Screenshot: http://i.imgur.com/goAUY.png

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: indicator-application 0.4.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic i686
ApportVersion: 1.23-0ubuntu3
Architecture: i386
Date: Fri Oct 14 07:33:47 2011
ExecutablePath: /usr/lib/indicator-application/indicator-application-service
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta i386 (20110901)
SourcePackage: indicator-application
UpgradeStatus: Upgraded to oneiric on 2011-10-06 (7 days ago)