What causes an item to allocate to selection task rather than a full pallet replenishment?

20 iLPNs in reserve of 20 cases each

Distrobution Order calls for 22 cs.

2 cs should go to selection task.

1 pallet of 20 cases should go to a full pallet replenishment task.

22 cases go to selection task...

Why?

Item configuration appears to be same as other items that work properly.

WMS SCOPE User - Jason