The plugin re-formats in-text citation, Deeznuts (2013) to in-line (Deeznuts, 2013) after triggering ‘Update Citations’.
How did you create the citation initially? If you just change the text in the document these changes will be lost after you reformat the document.
You need to use the option ‘suppress author’ in the details view to specifically set this option of the citation. This option is kept when you update the citations.