Incorrect arrival port for Atlas on 4/27/1880?

While researching my great-grandfather’s emigration from Sogndal, Norway to America, I sought help from archivists at the State of Mass. to locate a passenger list for the Cunard steamsip Atlas—other documents from Norway show my great-grandfather arriving in Boston. Today I received a photocopy of the passenger list for the Atlas—which includes my ancestor. The Atlas arrived in Boston on 4/27/1880...but this website shows the arrival being in New York. This appears to be incorrect; it should be Boston.