It takes a long time for DNS to propagate to China

I switched this site over to a new server a full 18 days ago. A week before that I dropped my DNS TTL to 3600 seconds (1 hour), from 86400 seconds (1 day). And yet today, I’m still getting a trickle of traffic coming in from China, Russia, Japan, and parts of Europe. Exactly what kind of DNS servers are you guys running over there? Evidently TTL is being completely ignored.

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