I think, but not sure there may be a bug on the amount of shards dropped in expert mode.. if a bug, it may not be exclusive to Macintosh..

Playing Hard level, I get an average of 28 or so shards form Hard Rifts..

So I've noticed that Expert level is supposed to Double the amount of shards given. Before and today I saw only 29 or so shards dropped in Expert level difficulty.. shouldn't that be 50+ ??

see expert level and the amount of shards on ground: http://imgur.com/nGm6BwW