Comments come from internal metadata or download.
If you choose to get metadata from 'filename' , you will not (normally) get any comments. Note: putting comments in a filename will probably cause file system problems.
If you want 'Strictly Alphabetical', you need to set the appropriate Tweak.
Note: Firstname Lastname does not have a Comma. There are plugins that flip and remove/add commas to normalize data
BTW Complain to the Publisher for not properly setting the Author Metadata value. The book should have never been released without that set properly.
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