But the module is missing on the published site.
Page title contains apostrophe.
This problem has been fixed in Parallels Web Presence Builder since version 11.5.4:
2. What's New Legend: [+] new feature [*] functionality improvement [-] bug resolved Parallels Presence Builder 11.5.4 21. [-] Users were unable to see the Commenting module on pages containing an apostrophe in the title.
- Upgrade your edition of Parallels Web Presence Builder to version 11.5.4 or above
- avoid using apostrophe in page title.