ok thank you, because when I change browser it works again.. but I made the mistake, since I know it comes from the bug, I redid it to pass a level as a gift, well the background always disappears each time time. Suddenly, on all browsers I have this bug on the Harem category, the background all in pink. And it's still not fixed in a day.
Edit ; I don't know why, I just deleted the browsing data.. the background came back, so I think I solved this problem on my own.. but I think as soon as I level up affection, this will make this bug again..