[–] PirateBear ago
Something in the message is tripping Cloudflare's protection mechanisms. If it detects certain things in a post (the most common thing reported is quotation marks), it'll do that to keep people from trying to pass scripting commands with their posts. This is because it is a common way to attack a website, and Voat's been under siege off and on for a few weeks. Here is the explanation of an XKCD comic that used this type of attack as a joke.
[–] Codewow [S] ago
Using quotation marks are what set it off.