Without seeing your entire tax situation, we can't determine where the discrepancy is coming from via this forum. 

If you double check your entries and verify them to be correct, then go through the "Review" section of TurboTax, if you have made any errors, you will be notified of them.

I have done this as well and have gone over them 3 times.  3 different ways.  The turbo tax totals are out by almost $300. more than totals on slips.  Did you ever find out why there was a difference on yours?

Not having access to your tax return makes it more challenging to advise what is happening, however, I recommend deleting your T4s and re-enter your T4 and if the difference reoccurs go to  "Review" section of TurboTax, if you have made any errors, you will be notified of them.