Viewing unread posts in Books does not mark "read"; Unread number goes to negative

[torqueJY32]

If I have an unread post in Books, clicking on that will not mark this post as unread, but the unread number on the upper right will decrement. If I jump from unread post to read post multiple times, the unread number would go to negative.

After clicking for some time, it's not marked as read and the unread number goes to -16.

[umutacar]

Perhaps this was meant as a feature (rather than a bug) for entertainment :)

[umutacar]

should be fixed