This item is equipped. It currently shows stat changes if equipped. The change should be nothing because it is identical to itself! Therefore the stat changes if equipped should be hidden as it contains no changes. The stats displayed aren’t even on this item, no idea where the game got them from.
Yeah, this seems to happen if you have the auto-compare items option ticked, compare an item then hover over any equipped item. The comparison is also only between the original 2 items.
So if I have a staff equipped & hover over another weapon I get the comparison stats (all well & good). However, if I then hover over an equipped item I still get those same comparison stats (below):
But if I then hover over any equipped item (including the weapon) I still get those same comparison stats: