Animation Rigging Package Multi-Position Constraint error.

I was following this Unity video about procedural animations

and tried the Multi-Position Constraint to control the spider´s body using the red targets as the source object.
But when I played it, it just flew away really far. The model in the video doesn´t have problems, but any other model does the same as the spider.
I tried multiple Unity versions and packages versions but are all the same. The chain ik, two bone ik, etc, works fine though.
How could I solve this?

Heres the video of what happens.

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I found the error, it was because all the models I made in Blender or imported had a x100 scale only on the rig that I did not notice. Now it works fine.