Education

As a follow up to my question. The NJ 1040NR form has a "'column A" for income from everywhere and a "column B" for income from NJ only.  My son has a W2 from PA and a W2 from NJ for income earned during the summer and during the school year.  If I follow their instructions and report the PA income along with the NJ income, he ends up owing a nominal amount of tax to NJ, but does get most of what was withheld back.  Does this seem correct?