Hey @Ares9323
I encountered the same issue so I looked around and found this:
Copy Points expects that it will get exactly one source and one target. That doesn’t mean one point but one set of points.
For me when I was using GetActorData with SelectMultiple enabled, it generated two sets of points, each containing one point.
So I used Merge node to combine them together and now CopyPoints works as expected.
Hope it helps.