Usually, the reason for information to appear twice is when one imports information to TurboTax using CRA's Auto-fill service and then enters the details manually. You may have to delete the repeated information if this is the case. 

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You will go to the Income section of your return- under TSlips- and continue and click on "EDIT" when you see the duplicates. If this doesn't work, you can start your return from scratch. 

Thank you for choosing TurboTax.