Credits for federal and state tax returns can be refundable or nonrefundable. Nonrefundable credits can only reduce your tax due to zero, while refundable credits can give you a refund after your tax due is zero.
It may be that even though your Pennsylvania W-2 tax withholding covered your PA tax liability, you have a PA refundable credit that is giving you a refund.
If you are in TurboTax Online, you can go to Tax Tools>Tools>View Tax Summary and look at the PA Tax Summary where you can see tax credits.
In TurboTax Desktop, you can go to Forms Mode and look at the PA-40 tax return. Credits are on lines 22 and 23.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"