Luckily, the reason for that seems to be pretty straightforward!
I attempted to use a glimmering roc feather at level 3 via the automatic [use] link on acquisition, and while it failed since you have to be at least 4 to use one, my spleen counter still updated +4 as if it had succeeded. It also removed the item from my displayed inventory until I did a hard item refresh.
I attempted to use a glimmering roc feather at level 3 via the automatic [use] link on acquisition, and while it failed since you have to be at least 4 to use one, my spleen counter still updated +4 as if it had succeeded. It also removed the item from my displayed inventory until I did a hard item refresh.