"An invalid item was removed from my inventory"

[Anthorin1]

I have a black bag symbol next to the "Ready to Level" symbol. ANyone know what this could be or what it relates to?

EDIT: Seems this is Astral Shards. So if you get some shards as a reward/otto box etc, it puts it in your inventory, flags it as invalid and then puts it into your astral shard bank.... Not the cleanest way of doing it, and given this should be transparent, it hardly needs a warning which persists until you logout and back in again.

N