Eyelashes curve not filling the full lengh of the curve - HELP!

Hi!
I was trying to replicate parts of the rig that Julien Kaspar shared on Blender Cloud.

I’m trying to do the eyelashes
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I create a guide bezier curve and then I create another bezier curve with a CURVE and a SHRINKWRAP modifier but when I use the “apply on spine” option on the Shrinkwrap modiffier the shape stop going along the full legth of the curve
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Why? how to avoid that?