Why is it a difference between the displayed versions of LXPanel?

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http://askubuntu.com – I am in Lubuntu Quantal and when trying to see LXPanel version I see the following: ~$ apt-cache policy lxpanel lxpanel: Installed: 0.5.10+git20120823-0ubuntu1 Candidate: 0.5.10+git20120823-0ubuntu1 Version table: *** 0.5.10+git20120823-0ubuntu1 0 500 http://fr.archive.ubuntu.com/ubuntu/ quantal/universe i386 Packages 100 /var/lib/dpkg/status dpkg -l lxpanel and Synaptic give the same info, while in PCmanFM Help/About it's 0.5.11. What does this mean? (This is related to this answer here.) (HowTos)