The "number" field for some of my citations is automatically filled with the "mendelay-groups" entry

For some reason the field "number" (see below) is being automatically filled and I am not sure how. It seems to be given the same entry as the "mendelay-groups" field (AKA. the folder name) but only for some of my citations. Further the "number" field cannot be accessed or changed as one of the 50 or so accessible fields. This entry shows up in my citations so it clearly needs to be removed. Thanks, Ben Example of part of a citation entry: mendeley-groups = {DCC}, number = {Dcc},