The pages for these two non-adult titles do not have image options: tt0239327 tt0239960 I guess they were incorrectly marked as adult movies in the past. Now the keyword and the genres have been corrected, but it is still impossible to upload images.
They both have the keyword "softcore" attached, but I'm not sure if that matters. Does the keyword apply? I'm not entirely sure what the criteria for "softcore" is, but I do know that softcore pornography definitely does not show penetration of any kind or contact between genitalia and any separate body part, as well as no eruptions, semen or reproductive mucus. Yet furthermore I figure something must set it apart from a typical nude sex scene in a non-pornographic movie.
Thanks for the report. It looks like the titles were previously marked as adult and have since been removed but some of the functionality was still enabled. I've removed this now and the option should become available in the next 24 hours.