I think sometime in the past couple of weeks last year's Canadian Orienteering Championships were dropped from the calculations of the rankings, which meant that all of sudden there were very few comparison points between eastern and western Canada, and also a big decrease in comparison with the US, and by extension, down under.
In fact, if my quick look through the ranked races is correct, the splits used to calculate the top three, BigE, Rhombus, Flakey, (all from Ottawa and using the same 2 or 3 races for their splits calculation), only have one connection point with the rest of the AP community, that being sberg (also from Ottawa, but who races typically on a different course). sberg raced against LKohn and RWorner at a singular race
in Ottawa, and beat them significantly, which tells the algorithm that the top three are significantly better than sberg, who is much better than LKohn and RWorner. LKohn and RWorner have competed in several races in the US, and from there the rankings spread out - with BigE, Rhombus, Flakey at the top of the rankings.