Did you download and import info from the CRA using the Auto-Fill My Return feature? If so, perhaps the CRA provided TurboTax with an amount by mistake.
To verify, sign in to your CRA My Account directly and have a look at what they have in your account for you.
To change or remove the amount in your return, navigate to the RRSP section: https://turbotax.community.intuit.ca/replies/2648068