Citation in square brackets


I have Ref Manager 12 on Windows 7 with Word 2010 an som problems.

I have startet a large document with citation style “Chemistry - A European Journal”. When I have citated an article I got square brackets with a number within and both is superscript and thats fine.

After some time without changing anything I got something like this {Author, year, Number \id} and I don´t want this, i want the superscript square brackets. I cannot change the citation style, if I change it in the window, nothing chances. An example is attachet.

A totally new document works without problems, but the document I have is quite large and I don´t want to waste my time to correct each citation by hand

Anybody can help? Thanks