I think there's an issue with Salvage Shard II not being auto-discarded even when the player has a Salvage Shard III.
I have a Salvage Shard III max level in the pink slot, but Salvage Shard II is not being auto-discarded. All the other irrelevant shards have been auto discarded appropriately, it is just Salvage Shard II behaving incorrectly.