That happened to me once.
I suspect it was a temporary server issue where the database recognised that you wanted to make a post, but so slowly that it had timed out before receiving the actual text.
Do you have a slow internet connection?
"Do not force others, including children, by any means whatsoever, to adopt your views, whether by authority, threat, money, propaganda, or even education." - Ven. Thich Nhat Hanh
"The uprooting of identity is seen by the noble ones as pleasurable; but this contradicts what the whole world sees." (Snp 3.12)
"To argue with a person who has renounced the use of reason is like administering medicine to the dead" - Thomas Paine