Thank you so much about your reply!
The issue was that because of the Area2D was together with the Label in a scene 2, the scene1(main scene) was running all the time the scene 2.So,thats why the string-numbers was one over the other.
So, i applied a personal trick and i solved the problem:I created in main scene an Aread2D over the Aread2D of scene2 and i deleted the Label of scene2.Then, i created a personal signal and i send it from the Ared2D of scene1(main secene) to the new Label of scene1(main scene).
Thank you again for your concern and i am sorry about my english.Its not my native language.