RRSP contributions don't follow a calendar year for tax purposes. If you have RRSP contributions made in the first 60 days of the following tax year, those contributions are entered on the previous year's tax return. In essence, those RRSP contributions should have been included in last year's tax return.
Not to worry. You can still claim the contributions. You'll just need to file an adjustment.
https://turbotax.community.intuit.ca/replies/2647992