Using @ tags in social media posts

when tagging @ usernames it only tags the first word...for example, if I tag a company like @Anika Digital Holdings...only Anika gets tagged and the rest of the word is discredited.  I have to manually go to the social media account and retag the names so they get picked up in the post.  is there a fix for this or are there coding issues preventing constant contact from allowing the tag to be picked up?