I have finally managed to post! I can't tell you how much trial and error I have gone through. I have given the buyer warnings within my description to double check shipping with me and have given the accurate weight in the description as the forms will not accept accurate weights.
Thanks for your suggestions. To the other Canadians who have had similar problems, you have to be thorough in the Shipping part of the form, which we didn't have to do before. It does work, just persevere.