score:3
Unlikely. If for some reason they were trying to use this as evidence of you being in the country, you could request your computer records (or show flights etc) to prove that it was merely an error with their stamps. And they could verify this themselves from both the Canadian or American side if they had to.
Any visa application in the future where you might get asked when you were there, just put the true dates - if they check, they're going to be looking at computer records again, not the stamps in your passport.
From personal experience, the only time anyone has ever looked at dates on stamps was as you were leaving the country, to ensure you didn't overstay. But they always defer to their own records, rather than the passport as a definitive source of information.