I had this experience too, i dont know if it worked exactly this way but seens like old purge was not guaranted to trigger immediatelly after the bar was filled, i have heard that the server mechanics delivered purges to users that was elegible for it, maybe the ones with the oldest complete bar, to avoid triggering to many purges at same time in the server.
And they was used to occur in a time window from 18h to 22h. So sometimes when the server had many active players even with the complete bar the purge toke several days to spwan. When was less activities it used to triggger more often for me.
In truth the old mechanic was much more complex and rich, considering regions of the map, and the human purges was more rewarding, they had good thralls to capture.
Nowadays the purge is much simplistic, they need to add crafters to loot tables, improve the quality of the thralls in cages, balance meteor and explosive golem, actually it’s complete nonsense.

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