What the CRA changed is the most important part of this conversation, since that's what the CRA determined was different from the tax return that you submitted. There are many reasons why the CRA might change things that are not due to TurboTax's calculations, including missing info, t-slips that are missing or incorrect, simple typos, etc... Even if it does turn out to be an issue with TurboTax, we would need to know what the CRA's results were to compare them with the software's results to see what went wrong.
