Just guessing here, but maybe your front page is displaying “all”, not “subscribed”? lemmy.world would be linked with lemmynsfw, so this post can show up in “all”.
You can also disable NSFW from your settings and re-enable if/when you want to see NSFW stuff.
![would you use this as your phone wallpaper? [f] [oc]](https://lemmy.world/pictrs/image/2a7af650-ecdd-493a-9299-4f6fba729696.jpeg){kind=link}
Just guessing here, but maybe your front page is displaying “all”, not “subscribed”? lemmy.world would be linked with lemmynsfw, so this post can show up in “all”.
You can also disable NSFW from your settings and re-enable if/when you want to see NSFW stuff.