Basically, I'm making an animation of a book whose pages turn/leaf. I made the pages with a minimum thickness so as to have double sides and in this way to be able to use an image for each side of the page. With this page it gives me this error: that is, the image is distorted and even modifying in UV/shading, the problem persists. I made 2 more pages and I didn't have this problem.
In the attached image you can see the nodes when I select a page. I'm not an expert, I just copied a tutorial online.