You don't have the attached drawings, so you don't know what the specific situation is.

According to what you said, there are two possibilities:

Explain these two kinds first, j, which means journal, that is, periodical; D disagrees, dissertation.

Say two possibilities:

First, when the original document is imported, the title contains the original document type and can be deleted under the corresponding entry;

Second, the style specifies the type of automatically generated document, so you need to change the style or change a style.