Distribution series source package page repeats several package versions twice

[Matthew Paul Thomas]

1. Go to <https://launchpad.net/ubuntu/precise/+source/software-center>.
2. Scroll down to the "Releases in Ubuntu" section.

What you see: Most versions are listed only once, but several are listed twice, linked to the same page each time.
...
5.1.14.1
5.1.14.2
5.2
5.2.1
5.2.1
5.2.2
5.2.2
5.2.2.1
5.2.2.1
5.2.2.2
5.2.2.2
5.2.3
5.2.3
5.2.4
5.2.4
5.2.5
5.2.5
5.2.6
5.2.6

This might have something to do with them being published in both -proposed and -updates.