I get a picture from the Nreal light,
here we can see that the center point of the target image does not coincide with cube(visualizer)
code of visualizer
setting of cube, the anchor of object is set to bottom-center
Is there anything wrong with the setting, I’m wondering… 
I noticed an issue myself with the TrackableImage library, where the size of the trackables is always reset to 0.397 m, causing issues in the centerposition if your trackable is larger or smaller than that. Could that be the same issue in your case?
Oh, maybe, I will print it out and measure it precisely tomorrow~ Hoping that’s the actual reason 
thanks~