Try checking the “Title Capitalization” of the J Biogeography output style to see if the setting is: Leave titles as entered. It maybe that it’s been set to a “sentence style” capitalization which capitalizes just the first word (Journal).
To check the Title Capitalization setting:
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Go to the EndNote toolbar, select Edit > Output Styles > Edit J Biogeography.
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In the J Biogeography dialog box click “Title Capitalization” and “Leave titles as entered”. (Refer to attached image).
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Close the output style which will save the changes as “J Biogeography Copy”. Change EndNote and MS Word to use the new output style file.