A report with a similarity percentage of more than 20% or 30% is considered bad. Though the percentage varies from institution to institution, the content of any work that is copied from web pages is considered plagiarism. This is why it is important to compare the sources of information indicated on the similarity report with what is in the submitted paper. Such comparison is good and is part of your knowledge on how to use Turnitin well, and you should take time to understand it.