Replacing author names in subsequent works: not working?

Using the Output Style “Bulletin of Marine Science” I am trying to format a bibliography with subsequent works by the same 1st author replaced by underscore (_____).  I believe I have the option within the output style selected correctly, but I am not getting the output I desire.  No instances of _____ are appearing in my bibliography.  

Edit>Output style>“my style”

Bibliography>Author lists>For Subsequent Works by the Same Author>Replace Repeated With ______

Any help or suggestions?

Could you attach the style you are using and paste in an example of two references it doesn’t work for?  Ensure you are using the style you altered for the manuscript (check the style in format reference/bibliography window).