When I’m posting an article, I usually have trouble to finish it at the first trial.
So I edit something, and always finds that I made another mistake or I have to edit one thing more.

Whenever I tried to edit for the second time,
on my edit screen, I always had the old article, not the one that I just edited.
(say, I added a certain sentence at the first edit, but the edit screen doesn’t show that sentence.)

I had the same problem this morning and tried to fix it.

First, I had to delete cached pages at the cache folder, and
found that I can turn off this cache thing by adding
define('DISABLE_CACHE', true);
to wp-config.php

and it works. (I just checked. )