Hi Inga,
What’s happening is that your repeat loop is firing the Clone block repeatedly without any delay. But the “do” section of the Clone block doesn’t have time to complete it’s blocks before the next image clone is created.
So you either need to add a Wait block inside the repeat loop, after the Clone block, and set it to a small number like 0.01 or 0.03. That may work.
Or, you need to do all the cloning first and then use a separate loop to set the pictures of all of the cloned images. That would be my approach.