What is a Maryland Nonresident PTE Tax? Does it refer to a tax that I have paid?

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PTE stands for "Pass-Through Entity".  See https://forms.marylandtaxes.gov/current_forms/PTE_Booklet.pdf for additional information.   PTEs must pay a tax consisting of 5.75%, in addition to a special nonresident tax of 1.75%, of the nonresident individual and nonresident fiduciary members' distributive or pro rata shares of income allocable to Maryland.  I, of course, do not know whether you have such pass through income.