Generating a New Turnitin Similarity Report

If your students are noticing that their submissions are being flagged with a lot of highlighted portions, even if there is a low plagiarism percentage, you may need to "refresh" or generate a new similarity report in Turnitin. This will account for checking plagiarism with any new additions to Turnitin's database, as well as resolve issues with unintended highlighted portions in a student's submission.

Instructions can be found in this article by Turnitin.