It does sound like a bit of an anomaly - and one which could be unsatisfactory to both provinces involved. I can understand why people would do it, given the lengthy waiting process and it's not dishonest or anything, but it doesn't seem a good system to serve the purpose.
People get fast-tracked to the less popular places and then move. The less popular province has now lost the person they helped to bring in quickly and the more popular province has a new person they didn't ask for when they already have a long list of other would-be immigrants. Sure, that's the system. But where's the logic?