In that case, you will need to deactivate the WPML integration and instead manually assign reviews to the Post IDs of the page language.
For example, supposing your page is: /reviews and the Post ID of your USA page is 13, Canadian English is 14, and Canadian French 15:
On your USA/Canadian English pages:
[site_review_form assigned_posts="13,14"]
[site_review assigned_posts="13,14"]
[site_review_summary assigned_posts="13,14"]
On your Canadian French page:
[site_review_form assigned_posts="15"]
[site_review assigned_posts="15"]
[site_review_summary assigned_posts="15"]