Where are you located? Assuming you're in Canada and you're only seeing US apps, the most likely cause is that your Roku account is associated with the US and not Canada. This can happen through no fault of your own (from a browser issue) or if you established an account while your were in the US and moved to Canada or if you're using a VPN or something else that masks your true location. The only way to fix an account associated with the wrong region is to create a new account, factory reset your Roku device, and link it to the new account. You'd probably want to close the old account.
How to close your Roku® account | Official Roku Support
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