Hi kellykelpie,
I think you've forgotten Airbus "logic" of naming the slats position.
The slats position corresponds to the handle position - (not to their actual position). When you have the handle in pos 2, the Slats run to pos 2 - but they don't extend any more at handle position 3.
With Flaps Full, the slats extend to their 3rd position which is called >3 using Airbus logic. Simples?
Many crews get confused trying to interpret what they see on the Flaps / Slats display compared with the QRH table. I think it's the most confusing aspect of that table's interpretation. A diagram of the the Slats with the "confusing" named positions, printed on the QRH page would certainly help.