I'm not entirely sure what you're showing us on the screenshot because what you're saying doesn't correspond to the info we can see in the screen.
The yellow dot is usually a marker for when other chapters are scheduled to go out, not the current one. Your current chapter on the screenshot is scheduled to go out on the 20th of December (a Saturday) not the 20th of November where the current dot is. It also says 12AM on your screen, not 12PM like you say in this post, so it's going out at midnight, not midday. Likely that means that setting it at 12AM PST means that for you it's going out at 1AM for you, so Thursday morning.