You have a custom prompt enabled (probably from viewing another one and pressing "start over") that is asking for opposites which will increase the noise a lot.
Clicking start over selects the default prompt but it seems like you are right.
Starting over by removing the permalink parameter gives me much more consistent results! An exampe from before: https://dalle.party/?party=Sk8srl2F
I wonder what the default prompt is. There still seems to be a heavy bias towards futuristic cityscapes, deserts, and moonlight. It might just be the model bit it's a bit cheesy if you ask me!
https://dalle.party/?party=bxrPClVg
https://dalle.party/?party=mmBxT8G-
https://dalle.party/?party=kxra0OKY (the last prompt got a content warning)
https://dalle.party/?party=Q8VYXU0_