Welcome to the world of the WONDERFUL (no) service that is Cloudflare.
Fortunately, this mighty protector of the internet is dumber than a box of hats!
To bypass Cloudflare's braindead idiocy, if it's doing what I'm guessing it is:
When you make a post, Cloudflare tends to fire up, and when you get through it's dumb capcha, it brings up the posting screen except with your post gone. Deleted! Is this the issue you're running into?
If that's the case, all you have to do is hit "back" on your browser twice. The first time goes back to the previous capcha screen. The second time goes back to your original writing, which will still be there. This may not make sense, but just try not to think about it too hard. Then, you hit submit again, do another capcha, and because Cloudflare, it'll go through that time.
No reason to bother with copy/paste or constant repetition of the captchas. Yes, it's THAT easy to get past it. This is literally how I deal with it *every* time. It has yet to not work.
A pathetic service, really. I've seen it generate an endless litany of complaints on.... every single site I've ever been to that uses it. This site is no exception.
The really sad part? Captchas only exist to stop bots. That's literally their one and only function. But Cloudflare STOPS NONE OF THEM. As you might notice, the board routinely gets FLOODED by bots. And not like, cleverly designed ones that mask themselves as actual people. Instead they're the sort where even a braindead moron can tell that they're bots, because they fill the board with absolute gibberish. But Derpflare wont notice this. Instead, it'll just taunt/torment ACTUAL people, over and over and over and over and over and over and over and over and over and over and over.
I'll be honest, more than a few thousand times, I've been tempted to leave this site entirely and for good, just because of how ridiculously annoying it is. At this point, I *seriously* dont want to know why anyone uses this nightmare of a "service". The answer would only anger me.
EDIT: That method I mentioned? Did it just now to post this!