All your income during the time you were an MD resident is taxable by MD. If your MD withheld taxes exceed the amount you owe, MD will refund the difference.
All the income you had after becoming a PA resident is taxable by PA. If you had insufficient PA taxes withheld, you'll have to pay the difference.
For 2017, the year of your move, you'll have to file a part-year resident return in each of the two states. This reference explains how to do that in TurboTax: https://ttlc.intuit.com/questions/1901227-how-do-i-file-a-part-year-state-return
If you're now a PA resident but you still work for an MD employer, you should file MD Form MW507 with your employer, to get them to cease withholding MD taxes. That's because MD and PA have tax reciprocity with regard to W-2 wages. (If you work in MD and live in PA, your income is taxable only by PA.) Here's a link to that form: http://forms.marylandtaxes.com/current_forms/mw507.pdf
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
