Improper revision: When revising a paper, if you simply delete or replace part of the content, rather than restate or organize the whole sentence or paragraph, the repetition rate may still be high. Because such a modification does not fundamentally solve the problem, it is only a superficial modification.

Improper citation: When writing a paper, if you directly copy and paste other people's content or the citation format is incorrect, this may lead to a high repetition rate of the paper. Because these contents are not quoted correctly or marked with the source, they are mistaken for plagiarism.

Lack of understanding: When revising a paper, some deep-seated problems may be overlooked if you only revise it word by word without deeply understanding the theme and content of the paper. In this way, there may still be repeated contents in the revised paper, resulting in a high repetition rate.

Database differences: Different duplicate checking systems use different databases and collect different documents and contents. If different duplicate checking systems are used for detection, different results may be produced. Therefore, when revising the paper, we need to pay attention to the detection results of different duplicate checking systems and make targeted revisions.

Lack of language ability: Sometimes, the author's language ability is limited, and he may not be able to express some concepts or theories accurately and clearly in his own language, resulting in a high repetition rate. In this case, it is necessary to improve language ability, read more relevant literature and materials, and carry out targeted training and practice.