Quote from Toto
That's because the scanlators like to restart the chapter count with every new volume... so, the red number will always represent the largest chapter number released. The only way to permanently fix this is to change how the chapters themselves are released so that this series is updated like every other one.
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"Officially, this machine doesn't exist, you didn't get it from me,
and I don't know you. Make sure it doesn't leave the building."