[Argo Smart Routing] not efficient cdn location.

I've had subscribed Argo Smart Routing for 7 months (since Aug, 2023).
I'm very happy because my website is served from CGK, the most visitors for my website come from.
But, recently, i don't know why, it's suddenly served from SIN which is too far even with JOG & DPS.

Is there a way it served back from CGK?