Episode Primary Photo

IMDB seems to have randomly chosen a primary image for an episode (or I unknowingly did it on accident), and I cannot change it. The instructions read, "To suggest a new primary, please select a different image to replace it." There is no option when I click on the other photos in the gallery for that episode to make one the primary image. The image should be the exact same poster for EVERY episode. https://pro.imdb.com/title/tt35855615/images