When measuring square slots, it is important that hits are taken clockwise or counterclockwise in order around the slot. For example, a square slot with 5 hits should have 2 hits on the first side, and one hit on the remaining 3 sides in order around the slot.
If there are 6 hits, there should be 2 on the first side, 1 on the next, 2 on the next, and 1 on the last. The hits should be strictly clockwise or counterclockwise.