Hey Darling, when something like this happens, contact a story editor and we can for sure help you out! Message me a link to the story you had to comment on (if this is still an issue) and I'll try to figure out the issue for you :) Usually it is because you didn't have 200+ characters for your comment.
You need to have 200 characters for your comment. Dumb, I know. It's done this to me too before. You can check on word how many characters it is by pressing the words button on the bottom left corner of word. Good luck!
Message me a link to the story you had to comment on (if this is still an issue) and I'll try to figure out the issue for you :) Usually it is because you didn't have 200+ characters for your comment.