Hi you all,
Thanks in advance for anyone who can solve this issue. I have a List of Images (inside a Thing called BGSlides) being used for Gallery of a Slideshow in the background of some pages the app. Also, I created a tool inside the Admin page to upload into and remove images from the gallery:
Unfortunely, all indexes are displayed duplicated (I think so). Everytime I upload an image, the repeating group display 2 of them, the same happens when I delete 1 of them: both are deleted (but only the duplicates, other indexes remain).
Here is the upload and remove Workflow.

