corrupted fields in my document, how do I 'clean' it?

apparently RefMan is duplicating the references and creating databases from the word documents I’m using!!

Whenever I use ‘insert a citation’, the reference appears twice. One in the database I’m using (database: Thesis) and the other in the durrent word document (database: thesis_v1.docx).

that only happens with some word documents…Whats going on???