This manga is marked as completed here at chapter 18, but according to other sources it actually runs until chapter 25. So either this listing is incorrect, or the status was marked complete too early.
That’s why I feel like there should be an option for us, as readers, to mark the status of a manga for ourselves. For example, I could personally set it as “ongoing” or “incomplete” on my end, without affecting how it’s displayed for anyone else. The official status could still remain, but I’d at least be able to track it in a way that matches the reality of the series.
It’s not the first time I’ve seen this happen. Sometimes a manga will be listed as “completed” when it’s still going, or listed as “on hiatus” when it’s already been cancelled. In this case, if the series really does end at chapter 25, then chapter 18 definitely isn’t the true endpoint—and it feels misleading to mark it complete this early.