You have multiple current milestones: Launchpad 1.2.3, and Launchpad Bazaar Integration 1.2.3. Granted this is because Launchpad isn't using Launchpad projects properly, but even if we had a single Launchpad project, you also work on Bazaar itself and might sometimes have milestoned bugs there. And once you'd fixed all your bugs for current milestones, you could go straight on to those for upcoming milestones without having to wait for current milestones to pass.
You have multiple current milestones: Launchpad 1.2.3, and Launchpad Bazaar Integration 1.2.3. Granted this is because Launchpad isn't using Launchpad projects properly, but even if we had a single Launchpad project, you also work on Bazaar itself and might sometimes have milestoned bugs there. And once you'd fixed all your bugs for current milestones, you could go straight on to those for upcoming milestones without having to wait for current milestones to pass.