The UPS ground calculator only works for deliveries within the US, although the shipping settings regarding that calculator are bugged and do not allow you to restrict the rule to the United States specifically. That is a known issue slated to be fixed when our interface is updated.
However, the larger issue remains that the UPS calculator cannot be used for Canadian orders at all. There is no work around for this, this is an incompatibility between our system and UPS', and at this time we do not have any plans to expand on the shipping calculators that are already available.
We recommend using different methods of calculating shipping for your orders, it is still possible to use UPS as a shipping carrier, and you can use packaging costs or shipping rules based on weight or quantity to apply a cost of your setting to any order shipping to Canada or a different country.