Hi you,
#1. There is confusion about your pages. I deleted all the shop pages and recreated it for you. Please check your shop page: https://visionsub.es/productos
#2. Ok, I fixed this issue
#3. Please go to Customize: https://visionsub.es/wp-admin/customize.php?url=https%3A%2F%2Fvisionsub.es%2Fnoticias
->Blog -> Config page blog: https://ibb.co/BVCwNtS
#4. Contact page: https://visionsub.es/contacto