Why does my mask path change position when pasting it on a position parameter?

[AceLegacy]

I've looked for this answer everywhere and the only answer I found was here https://community.adobe.com/t5/after-effects/why-does-my-path-change-position-when-i-paste-it-to-a-m...

and still, it does not help me. 
So let's settle this for once and for all.
How DO I SOLVE THIS?

[LordVal · Accepted solution]

Hello (maybe it's better to start with this)

As explained in the reference post, modified paramteters in your layer/comp may get this problem...

For example, if you change the scale of the target and/or of the origine of your path, then this will not work.

To solve it, you need to pre-compose the layer/comp that are not set with all default parameters with moving all the attributes into the new comp, then trace your path or copy it on its position.

Best

[AceLegacy]

That sort of helped me. Although it's following it its path now, the layer is getting cut off

[AceLegacy]

Changing the new pre-composition's size to the same as the main composition solved it! Thanks, val.

[AceLegacy]

Would you know how to explain how I can make the same animation "repeat" for all those layers, although in different directions? Is there a way to do it that is not 1 by 1?

[LordVal]

If your motion paths are not the same, to my knowledge you can not "repeat" your animation for the other layers.

What you can do to save time is to copy/past the position keyframes (so with the pmotion path) and then set only the first and last one of the new layer.