We're in the process of implementing hreflang markup for Canadian & US versions of a website.
We've found that about half of our Canadian traffic has browsers that are set to en-us (instead of en-ca, as would be expected). Should we be concerned that Canadians with en-us browser settings will be shown the US versions of the website (as the hreflang would markup 'en-us' for the US version of the page).
Our immediate thoughts are that since they're likely to be searching from Google.ca and would also have Canadian IP addresses, that this won't be an issue. Does anyone have any other thoughts here?

