Paragraph styles are still not used properly

Having problem uploading Ebook File which is in Indesign got Soft Rejection.couldn’t understand actual problem please help or support to make the file acceptable.Graphicrever is saying,

Unfortunately, the paragraph styles are still not used properly. As per our submission guidelines, the use of paragraph styles is not mandatory, but since your template contains paragraph styles you need to apply them to the text properly, otherwise the template is really hard to edit. Thank you.

Hardly need help regarding the problem.Thanks In advance