Ogre Lords spawning slower?

Xiulan

Master
Anyone else notice that ogre lords seem to be spawning more infrequently?

At first I thought I might just be missing them due to more people killing them this month, but then I tried hiding in one of their spots for a few hours. Normally I can hit that spot four times an hour and there's usually two OLs each time. But today I saw only four spawn there over the course of two hours.
 
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