For which province the return was filed? 

It can happened in different situation. Was is for a TurboTax Online or Desktop. Sometimes, when a customer is using Auto-fill from CRA and the T-Slips are not reviewed before NETFILE, it can have some information missing (like the province) or amounts that were not in the importation. It s really important to always verify each T-Slip.

Because we do not have access to your tax return, we can't explain the exact reason for your situation. But, if you want, you can contact our product support team by phone. They have access to tools we don't have here in Community, like screenshare, and see if the issue has to be escalated into an investigation.

Thank you for choosing TurboTax.

My return is showing my CPP contributions as an overpayment - if I put a $ amount in box 26, it corrects it.  Is this a turbo tax error OR my employer as they don't have a dollar amount in box 26.

Thanks

Can I please get an answer on my question below about the CPP

Thanks  you

That would be your employer, as box 26 is supposed to be filled out unless none of your earnings are included in the pensionable amount. In that case, you should not have had CPP taken from your pay.