I went to pay my taxes through TurboTax, via debit thru my checking acct. But it says "0.00" will be debited. Why is it not showing the real payment I owe?

Did you review the return yet ?   Are you trying to file an amended return form 1040X?

I already filed the 1040, no amending.

THank you

If you have already filed the return you cannot change anything in the FILE tab ... if you still need to make a payment then do so online here :  https://www.irs.gov/payments