Customer service honestly have no clue how the Canadian shipping calculator works. It is always a good idea to first come to the boards with a problem like that as we are more familiar with how things on .ca work.
When you are shipping to the U.S. and to other international countries, which service are you using for the U.S.? Since different Canada Post services go to the U.S. then to other countries, you must specify different services.
If you are using small packet, you should specify small packet USA for the U.S. and small packet international for other countries. The same is true for light packet. Actually for light packet, there is one rate for the U.S. and one rate for all other countries so if you want, you can use flat rate shipping. However, the cost for small packet does vary from country to country.
You may be using the short version of the sell your item form which only gives you one international option. If you want to ship to the U.S. and other countries, click on the link on the upper left of the syi page...it says something like change to expanded version.
Also, I strongly suggest that you don't use small packet international ground. It can take anywhere from 4 - 12 weeks from delivery and in some cases, a buyer will file an item not received case before that.
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