According to Google Scholar, two of my papers have been cited 10 times by other scholars (my 2014 paper “Goedel’s Loophole” and my 2010 paper “A Game-Theoretic Analysis of the Puerto Rico Status Debate“; see screenshot immediately below this paragraph), but according to SSRN (a popular platform scholars use to post ungated versions of their work), those same two papers have only been cited twice (see the other two screenshots on the bottom of this post). I love SSRN, but what is the source of this discrepancy?