Responses
I figured it out! A specific word must be censored by the system that automatically checks the not visible box. If you delete or edit out that word, you can save it so that it is visible. The issue is that the word changes per manga, and it can even be one that isn't problematic at all, just any ordinary word. Pretty strange. For one long comment, I copied my response and then pasted individual paragraphs and tried to save it until I came across a paragraph that checked the box. From there, I pasted sentences from that paragraph until I found the word.

Sometimes, when I try to write a comment on a manga here under the 'add this manga to my page' section (the dialogue that pops up when you rate a manga), the 'only visible to yourself' option is automatically checked. No matter how many times I adjust my comment and unclick the box, it's always clicked lol. Anyone know why this happens to some works? I think my comment might be too long?