When I generate entries for the American Chemical Society journal 'Biochemistry', it all looks fine as the journal field says Biochemistry and the abbreviation field is correct as Biochemistry. However, when I generate a bibliography it uses the journal name 'Biochem. Mosc.' or 'Biochemistry (Mosc.)' which is the English language version of the Russian journal Biochemistry. All the volume and page info etc is correct, just the wrong journal name. The problem seems to reside in the automatic abbreviation of the journal name because the problem goes away when the box to 'Automatically abbreviate journal titles' is not checked.