Bugs Warning: NSFW, suggestive and/or image showing too much skin is not allowed.

Is this some kind of bug? I am trying to begin my story for "Hubris of Wulfricus Wīgric: Tale of an Adept Overking" and the image I loaded has 0, as in zero, as in no skin. It is supposed to be a technomagic desk with an empty chair. So, how on Earth am I getting a warning that I am showing too much skin?

Blue nipples!

I suspect this is probably because the particular arrangement of those three blue spheres and the pipes between them caused it to be misidentified as something else that very much not allowed.

I think that's just a general warning. I made a dummy fiction a while back to see if it gave me that warning with no cover and it did.
I'd love to know if I"m wrong there, however.