If you wish the copies to print collated, check the checkbox for Collate.
In multiple page jobs that are collated, a complete set of pages in a job are printed followed by another complete set of pages. For example, printing 2 copies of a 3 page document, the printer prints Page 1, Page 2, Page 3, then Page 1, Page 2, and Page 3 in order. In this case, the printer starts printing after processing all the print data so that it takes longer to print collated copies than uncollated copies.