I think what you're hearing is just the mechanical sound of the strike, on the higher notes especially, mixed with a bit of room reflection. I loaded up the Kontakt factory glock to compare, and the sound is there as well. Clangorous or bell sounds are tricky to record, and you have to try to find a balance between getting too close with the mics, or being too far away. I wasn't there when this was recorded, but there do seem to be reflections coming from a nearby wall or another instrument. That said, I use this in arrangements often and have never noticed it. But then, I haven't used it in an exposed context.
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