Inserting references creates additional bibliographies

Whenever you insert a new reference using the Citavi Word Add-In, an additional bibliography is created each time.

The Word Add-In fields in your document were converted to text in one of the following ways before you experienced this issue:

The Word document was saved in .odt format.
The Word document was saved with Word for Mac at some point.
The Citavi command "Save a copy as static text" was used to convert the Word Add-In fields to text (see screenshot).
The Word command for converting all fields to text was used (shortcut Ctrl+Shift+F9).

For causes 1 and 2:

Save the Word file in .docx format. Then, insert all references again.

For causes 3 and 4:

Open a recent backup of your Word document as described in this Citavi manual chapter.