In the versions prior to 21.4 the module version numbers tented to be confusing. To fix this, there is a changed “Install Modules” page.
This page has been redesigned to avoid confusion.
The standard modules appear in a separate secsion without version numbers. And the somewhat long names (like “Content Server Comments” are simplified to “Comments”.
The optional modules are listed in the “Installed Modules” section. They now feature “Build” instead of “Version” to clarify the meaning.
Have much fun with the new “Install Modules” page.