Anyone else here use Weather Underground?

I've noticed a peculiarity in their weather photos section.  If I try to give a photo a low score, it totally ignores my vote.  It will give me the "Already rated" screen, but it won't change the current rating nor will it advance the number of times the image has been rated.

I tried e-mailing the photo admin there, but never heard anything back.

Is this a bug?  Do they have some system where they throw out the highest and lowest votes, like in figure skating?  Or do they just ignore low votes in some touchy-feely-don't-hurt-anyone's-feelings kind of thing?