[JimmXinu]

Originally Posted by edeniz

Uploaded the epub in question.

Assuming you're still using the personal.ini that uploaded earlier, the problem is because you're using chapter_title_strip_pattern to remove chapters titles like 'Chapter 1', but you didn't set add_chapter_numbers true, so nothing is replacing them.

Relevant settings:

Spoiler:

## Do not like the numbers at the start of chapter titles on some
## sites?  You can use strip_chapter_numbers to strip them off.  Just
## want to make them all look the same?  Strip them off, then add them
## back on with add_chapter_numbers:true.  Only want them added back
## on for Table of Contents(toc)? Use add_chapter_numbers:toconly.
## (toconly does not work on mobi output.)  Do not like the way it
## strips numbers or adds them back?  See chapter_title_strip_pattern
## and chapter_title_add_pattern.
strip_chapter_numbers:true

## add_chapter_numbers can be true, false or toconly
## (Note number is not added when there is only one chapter.)
##add_chapter_numbers:true

## (Two versions of chapter_title_strip_pattern are shown below.  You
## should only have one uncommented.)
## This version will remove the leading number from:
## "1." => ""
## "1. The Beginning" => "The Beginning"
## "1: Start" => "Start"
## "2, Chapter the second" => "Chapter the second"
## etc
#chapter_title_strip_pattern:^[0-9]+[\.: -]+

## This version will strip all of the above *plus* remove 'Chapter 1':
## "Chapter 1" => ""
## "1. Chapter 1" => ""
## "1. Chapter 1, Bob's First Clue" => "Bob's First Clue"
## "Chapter 2 - Pirates Place" => "Pirates Place"
## etc
chapter_title_strip_pattern:^([0-9]+[\.: -]+)?(Chapter *[0-9]+[\.:, -]*)?

You could add add_chapter_numbers:true and you'd get chapters '1.', '2.', etc.

You could set strip_chapter_numbers:false or change to the default chapter_title_strip_pattern instead of the more aggressive one.

Alternatively, you could experiment with look ahead regex pattern matches for chapter_title_strip_pattern so you only remove 'Chapter 1' if there's something after it.

I will also consider if I should change the system in some way to prevent this behavior, or if it would ever be desirable.