Ideally, Turnitin does not count references because they are not part of the main content of a paper or an essay. However, this depends on the settings that your faculty/university has preferred on the plagiarism scanning system. In most cases, most universities do not allow scanning of references, therefore this should not be a worry for you. Either way, references should not worry you because they are good for a paper, and do not constitute plagiarism. In reality, references do not comprise the plagiarism report, even if they are scanned and highlighted for matching.