Recently, FFXI's incredible popularity has led to a population boom! The introduction of the Merit Point system and the rapid increase in the number of missions and quests have also increased the traffic in several select areas.
In order to allow everyone room to engage in battles to their heart's content, the FFXI development team will be adjusting enemy locations in the next version update. The bulk of the changes will be to areas from the newest expansion pack, "Chains of Promathia." These adjustments will give players more freedom when choosing where to battle.
The next version update is currently in the testing phase, so look forward to experiencing it soon!