Firstly, a click is not equal to a visitor nor a visit. The same person
could click the same link more than once over a span of time.With that
aside...I believe there are some redirects happening between when the
user clicks the link in LinkedIn vs when your web page opens. With some
browsers, those redirects unfortunately don't forward the original
referrer. As a result, AA may most likely read them as not having any
referrers, i.e. "Typed/Bookmarked".