If you are playing on a "Classic" server or a specific event server, there are often level caps on loot.

The quickest way to resolve a state-bug is to re-log or use the /u command to refresh your UI. If you are in an instance, try moving a few meters away from the pile of loot and coming back to "reset" the interaction range. Summary Checklist for Quick Fixing: Clear 5+ slots in your inventory. Check Siel’s Aura status (Classic). Verify Group Rules with your leader. Check for "Unique" duplicates already in your bag. Relog if the message persists despite having space.

Sometimes the game thinks you are still "receiving" an item that hasn't cleared the server queue.

One rare but confirmed fix: (from Free-for-All to Leader-only or Round-Robin). In party settings, the error sometimes targets specific distribution modes.