It may have something to do with the nation's strategy for the week. If they're set on offensive then they'll be busy trying to attack beastmen controlled zones. I went to a Windurst controlled zone recently and there were 4 groups of allied NPCs swarming around the fort.
Carbuncle failed pretty bad this weekend. Sandoria has 3 zones, Bastok has 2, Windurst has 4, and Beastmen 14.
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