Hey,
After you destroy the first entropic shard, the others will not show a waypoint until you're very close to them. Walk around moving farther into the area and see if they appear.
If no waypoints show, then use a guide that shows where the shards should be, and if they're not there try using Salvation's Grip in that spot. If that still doesn't work, take a screenshot showing where the shards should be.
You can upload them to an image sharing site like imgur and just post the links here.