While chatting in the Incomprehensible room, I encountered this strange error.
The other chatters claim that they do not see the small white circle and its shadow. Is it a bug?
Edit: I found it again. This bug seems to pop up during night time. This one appeared at similar time to the other bug.
I inspected element, as Jarrod told me to. This came out:
The spot disappeared later, even though I did not refresh. Click on the image to make it bigger.