Posts not appearing after posting

Sometimes when I post something, my post doesnt appear, for them to appear, I have to log out then login and the post appears, and If I post again, it disappears again, the last post and the new one.
How to fix this?
Tell me please

try clearing cache https://help.forumotion.com/frequently-asked-questions-f5/how-to-clear-the-cache-in-ff-ie-t22597.htm