Why Rich Text label freezes?

Godot Version



I have a rich text label as a child of an control scene.
If I run this scene it works perfectly
But if I run from a scene up in the hierarchy and I scroll the rich text label, I see the text moving, but there is also a duplicate of the text stationary in the backround.
The second scne is like that:

do you have any code to instantiate the text?
or is there any duplicate?

There seems like it is a duplicate but there is not