Sometimes loot can't be picked up despite running from the area where you found the loot, it used to work and I called that a network bubble bug where loot would be stuck in the world and the only way to take loot was to run 100meters away from the area to then run back and pick it up.
You can't drag nor choose to take it via right clicking, the only way to take the loot is to put it in your hand if the loot can be picked up by hands.
This has been an issue since a few builds back.