Hi Flexpwr,
I can imagine that under the worst set of circumstances (end-travel sensor failed, hydraulic valve block damage, etc) the slats could be pushed outwards beyond the last extended position, resulting in the position sensor >3 and some crooked slat position.
Could it be what the table presented tries to address?
Nothing as complicated as that.
The different 3 Slat positions are illogically given 4 numbers which correspond to the Flap Handle Positions.
This is very confusing for someone using logic.