Why would my KY return show $0 after filing but showed a refund before that

Did you already submitted your return and was it accepted by both the IRS and State? 

If you logged in into your TurboTax account after your return was accepted and you hit the amend button it will reset the refund section on the top to "0". If this is not the case please reply to this thread with additional information. 

Where is it showing "0"?

Have you tracked your refund on the KY website? KY Where is My Refund

Keep in mind, once your return is accepted for processing by the IRS and/or State TurboTax has no control over the processing of your return and/or release of your refund. If you have any inquiries on any delay you should contact the IRS or your state Department of revenue directly for further assistance.