Moving Motor6D also moves the entire part it's attached to?

I’m currently trying to rig a model, but I’m having trouble moving the Motor6D. What I’m trying to achieve by moving it is to set it as the anchor/rotate point, just for the sake for easier animating.

It had worked fine before; but I don’t know what happened, it doesn’t work when I tried on other models. I don’t really see any difference in the way I attach the Motor6D and the plugins that I used.

For example; let’s take this lower-half of a pet, I’m trying to animate it’s tail.
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The rigging is perfectly fine as seen here:

However; yeah, the Motor6D is positioned in the center of the part, which makes it rotate around the center. That’s the issue I’m currently having. I can’t move the Motor6D to the edge. If I do; the part moves to where the Motor6D is at. It’s as if the part is welded to the Motor6D.

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(motor6D at the center of each part, looks as intended but doesn’t rotate as intended.)

When I move the Motor6D to the edge so it rotates around the edge instead of the center:
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This happens when I try animating it.
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It’s honestly giving me tons of headaches due to it working prior to this. I’ve also tried switching my plugins, but it doesn’t work either. I’ve used RigEdit Lite, RigEditor, and Custom Character Editor. All these plugins causes the same moving-to-Motor6D issue.

How the tail is rigged:
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All parts are unanchored besides the HumanoidRootPart of the model.

Thank you so much if you could help me!

Updates and what I’ve found so far:

Here’s an example of one of my rigs where the Motor6D can be moved and didn’t cause any issue; the way it’s rigged is exactly the same as above ^
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Base > Part1 > Part2 > Part3 > Part4 … etc

The part properties are the exact same, the plugins used are the exact same.

It seems like these green thingys plays a huge role to the issue,
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On the stone rig, the green thing stays there when I’m done rigging and animating it. However; on the tail rig, the green thing is gone. Only the blue is left there.

Solved this issue by attaching the Motor6D to my rig using RigEdit (premium version, unsure if the Lite version would work).

Before this, I would attach the Motor6D using Moon Animation Suite’s Welder tool, and apparently that was the issue.

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