Here are the logs for both runs.
To launch the page count I've always used the button I've got on the main Calibre toolbar with the book selected in the Library view.
It's pretty weird, I agree...
I'm attaching the screenshots of the settings and the results of the first and second run:
https://imgur.com/a/ROw3CZ5 (it seems like imgur flagged the images as "mature", I don't know why. I assure you it's safe to open them
)
First Run:
Count Page/Word Statistics
do_count_statistics - book_path=/var/folders/bl/s0tkk9nx3vsfm2pb8scfnw2c0000gq/C/calibre_6.29.0_tmp_5bvwbe10/ze2sc2nm_count_pages/2122.epub, pages_algorithm=0, page_count_mode=Estimate, statistics_to_run=['PageCount', 'WordCount'], custom_chars_per_page=1500, icu_wordcount=True
do_count_statistics - job started for file book_path=/var/folders/bl/s0tkk9nx3vsfm2pb8scfnw2c0000gq/C/calibre_6.29.0_tmp_5bvwbe10/ze2sc2nm_count_pages/2122.epub
-------------------------------
Logfile for book ID 2122 (Rimini - Pier Vittorio Tondelli)
Method of counting _page_count_mode=Estimate _download_sources=[]
results= {'PageCount': 358, 'WordCount': 99523}
Found 358 pages
Found 99523 words
2122
do_statistics_for_book: /var/folders/bl/s0tkk9nx3vsfm2pb8scfnw2c0000gq/C/calibre_6.29.0_tmp_5bvwbe10/ze2sc2nm_count_pages/2122.epub 0 Estimate [] ['PageCount', 'WordCount'] 1500 True
Calculating page count using APNX Accurate algorithm
Estimated accurate page count
Lines: 11109 Divs: 37 Paras: 2331
Accurate count: 358 Fast count: 300
Page count: 358
Word count using icu_wordcount - trying to count_words
Word count - used count_words: 99523
Word count: 99523
Second Run:
Count Page/Word Statistics
do_count_statistics - book_path=/var/folders/bl/s0tkk9nx3vsfm2pb8scfnw2c0000gq/C/calibre_6.29.0_tmp_5bvwbe10/tde8htyv_count_pages/2122.epub, pages_algorithm=0, page_count_mode=Estimate, statistics_to_run=['PageCount', 'WordCount'], custom_chars_per_page=1500, icu_wordcount=True
do_count_statistics - job started for file book_path=/var/folders/bl/s0tkk9nx3vsfm2pb8scfnw2c0000gq/C/calibre_6.29.0_tmp_5bvwbe10/tde8htyv_count_pages/2122.epub
-------------------------------
Logfile for book ID 2122 (Rimini - Pier Vittorio Tondelli)
Method of counting _page_count_mode=Estimate _download_sources=[]
results= {'PageCount': 358, 'WordCount': 99523}
Found 358 pages
Found 99523 words
2122
do_statistics_for_book: /var/folders/bl/s0tkk9nx3vsfm2pb8scfnw2c0000gq/C/calibre_6.29.0_tmp_5bvwbe10/tde8htyv_count_pages/2122.epub 0 Estimate [] ['PageCount', 'WordCount'] 1500 True
Calculating page count using APNX Accurate algorithm
Estimated accurate page count
Lines: 11109 Divs: 37 Paras: 2331
Accurate count: 358 Fast count: 300
Page count: 358
Word count using icu_wordcount - trying to count_words
Word count - used count_words: 99523
Word count: 99523