Yeah chapters 50, 57, and 59 are missing
You can read chapter 50 here: https://kunmanga.com/manga/im-a-worthless-stepmother-but-i-love-my-family-madly/chapter-50/
I couldn't find translations for the other chapters tho...
*You can read chapters 50 & 58 here.*
https://kunmanga.com/manga/im-a-worthless-stepmother-but-i-love-my-family-madly/chapter-50/
In all the sites that 60 was available, it was repeated so I'm guessing the current English translation is updated till 59.
Also you can reread some chapters. I'm not sure if it was 56 and 57 that have missing pages.
i think 58 is just a repeat chapter of 57. and 60 is a repeat chapter of 59