Transactions don't just disappear. They can get stuck from time to time, but would still show up as pending. When I look at your address, I don't see any outgoing tx. Just the incoming 1 testnet ether

https://ropsten.etherscan.io/address/0x192a2c9ae6fc9a04bb696dbf547e695e8b8ee235

Something else must be going on if you insist that you indeed submitted the comment. But from what we can see and verify, it looks like you never submitted a comment on the platform. Even your 1 eth is untouched which indicates you didn't use Gas.