When a user likes a reply to an EasyDiscuss discussion, a notification for the like will show in EasyDiscuss's notification section but not in EasySocial's notification section.
I'm referring to when a reply is liked, not when the initial post was liked (judging by your screen shot). I've discovered all alerts in EasySocial and tested again to be sure. See attached screen shot....
I've added a fix in your ../components/com_easydiscuss/helpers/easysocial.php. Please give it another try. This fix will be included in the next release of Easydiscuss.