Good day, Suujin here!!
There are two possible reasons that this happened
(1) Your topic contained flagged words such as other manga hosting sites, social media sites, foul words, etc. It is set that if your topic contains such words, your topic will automatically be deleted.
(2) The tab/page has been 'idle' for too long. If you are not interacting with buttons and hyperlinks for a while, the browser will load and display the cached site page, meaning what you're currently seeing is the 'downloaded for offline use'. So when you click on the Post button, it will refresh the page instead.
This issue can be fixed by
(1) Removing/Replacing words which you think are flagged
(2) Copy the text you typed, refresh the page, paste the text, and then post. This way, you wont lose any of the text you typed.
Am i blocked from posting questions? cuz my qs keep getting removed or is it just me who can't see them?