Halo spot light shifts

Hi
For an animation I let a spot light with halo effect shining through a clef shaped hole (curves). This worked perfectly for a few days but suddenly the halo rays seem to be missplaced and appear (depending on the camera angle) next to the hole. The wall is as thin as possible so it can´t be a shift due to the extrusion.
Anyone an idea how i made the rays coming exactly out of the clef? :spin:

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very strange.

I found the solution: The light cone was scaled unconstrained. Apparently this effects the position of the halo rays.