Problem with De Buck citation style?

Recently I am getting the field 'extra' in my references. I am running Zotero 4.0.20.10 under Firefox 46.0.1 & word 2010. I have updated De Buck style & word add-in.

The reference looks like this:
Historisch dag-verhaal van het belegeren en inneemen der stad Bergen op den Zoom [...] door de kroon Vrankryk (Kn 17843) (Haerlem: Enschede RecordID 14161Pamphlet Nr. 17843).

The'extra' field looks like this in Zotero:
RecordID 14161
Pamphlet Nr. 17843

The 'extra' field should not be in the reference. Does anyone know what is wrong?
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