The Pickup (Pkup) value in the Group History report reflects the net change in rooms for a specific stay date, not just newly created reservations. If both pickups and cancellations exist for the same arrival date, they are combined into one total.
For example, if 22 group reservations were picked up and 5 reservations tied to that arrival date were cancelled—even if those cancellations occurred long before arrival—the report will show a pickup total of 27. This is expected behavior, as the report is driven by stay date impact, not by when the reservation activity occurred.