Multiple Subject Entries with Library of Congress Suggests Plugin

I have recently installed the Library of Congress Suggests Plug-in. I want to add multiple subject entries for each item. When I type the first entry the Library of Congress Suggests list comes up. I put a full stop and space after the first entry and tried to add another one in same box but the suggests list does not appear. Do I need a separate subject box for every subject heading?

Yes, it's probably best to do a separate subject box for each one.

The autosuggest mechanism from LoC that the plugin uses won't concatenate suggestions as far as I know, so it'll have to handle each one as a separate subject entry (which also keeps the metadata a bit cleaner in any case).