The database of the system is inconsistent: each different duplicate checking system has its own data resource database, but it is not the same. For example, some free duplicate checking systems only contain Internet resources. In some authoritative duplicate checking systems, in addition to Internet resources, there are their own literature databases and information databases, which are still collected in the system databases. The paper duplication checking system should be done well according to the ratio of the repetition rate between the paper and the system database, so the repetition rate of duplication checking in different databases is inconsistent.

Inconsistent detection algorithms: In addition to some databases, detection algorithms are also one of the reasons that affect the final duplicate checking results. Some paper duplication checking systems will judge plagiarism as long as they recognize a few words. No matter whether the source of this article is similar or not, articles with the same sentence will be related.

Inconsistency detection range: most duplicate checking systems are full-text detection, including the title and abstract of the paper and the text. You know, different methods of submitting duplicate checks will unconsciously increase the repetition rate of your paper.