Are you sending them as epubs or kepubs? If kepubs, you may want to copy the filename.kepub.epub version back to your computer and open it with an ePub editor to see if you can see any oddities around possessives with the kobo spans.
You may also want to open Preferences => Output Options => Kepub output and see if you have Prefer improved text justification to proper highlighting checked. If not, check it and resend the book to your Clara BW.
Also, being a bit pedantic, this has absolutely nothing to do with the epubcheck plugin. Perhaps the Devices forum would have been a better choice.
|