EndNote changed my citations absolutely randomly


I’m experiencing a serious problem with EndNote. It exchanged citations in my word documents randomly. About 80% of my citations are now new ones (absolutely randomly from different research fields, years, author, topics etc.). My old references are still in the EndNote library, but not correctly cited anymore in the word document.

Does anyone know the reason for this or has a solution? I would appreciate any kind of help.

Many thanks Conny