I have not seen it on here in quite a while, but do see it on other websites on occasion. I assume it is just a glitch when they get overloaded, an error on the web processing, etc. if it happens I try the reload button, or go back a page, or just come back later.
"The Constitution is not an instrument for the government
to restrain the people, it is an instrument for the people to restrain the
government lest it come to dominate our lives and interests." Patrick Henry