Why does particle system keeps following AR camera?

Hello,

I have a particle system added as a child of my prefab. When instantiating the prefab, the prefab gameobject will be spawned at the right position. I tried to print the location of the particle system, the location vector shows the right values as expected. However the actual particles are always emitted from the camera, and the particles and emit source keep following the camera as I move my phone around. I did not make any connections between AR camera and the particle system, wondering why this is happening.