Reference pages, bibliographies, works cited pages, and what have you often show up as plagiarism in Turnitin.
“That’s not fair!” you may say.
You’re right, it’s not really accurate.
Fortunately, teachers and tutors are generally aware of this. This video discusses how to remove these pages from the plagiarism percent. If you are student, know that just because a certain percentage comes up, in the end your professor (a human) is the one checking for plagiarism.
If you are a tutor or teacher, make sure you take action to prevent a bibliography from counting as plagiarism. Know that Turnitin’s algorithm is flaws in this area.