Inconsistency in duplicate checking: Only the text of the paper may be checked in self-examination, while the preface, bibliography and thanks of the paper will also be included in duplicate checking, resulting in different duplicate checking results.

Difference between algorithm and database of duplicate checking system: Different duplicate checking systems may adopt different algorithms and databases. The more data collected, the more accurate the detection results will be. If the algorithm of the duplicate checking system is strict, the detection result of the paper will be more accurate.

The duplicate checking system used is different: the system used in the self-inspection may be different from the school system, and the final test results may be different.

Different versions of papers: If the version of papers detected by yourself is different from that detected by the school, it may also lead to different duplicate checking results.

Error in duplicate checking platform: Sometimes there may be errors in duplicate checking platform, such as missing and wrong checking, which will also lead to differences in duplicate checking results.