So this has happened multiple times with my raid team. I have used the twenty moldering shards after killing oryx all for ONE item from the chest. This has happened to more than one of us. Bungie you may want to look into this.
-
my fireteam kiled orxy last night. only one person didnt have 20 mouldering shards. 5 people got 2-3 rewards. the one guy got 1 reward. i got helmet,chest,scout rifle. Good luck