Problem to send books to Kobo Aura HD

Hi,

I have a problem with Calibre and i hope you can help me :)

I have a kobo aura hd since about 2 years, and a new problem appears : some books i want to upload from Calibre to my reader are not visible :
- I sent books (cbz format)
- I can see them in calibre when i display reader books, but the size is "0"... (first capture)
- When i navigate to collection in my reader, i can see "1 book", but when i go into this collection, the list is empty...
- When i replug the reader the book disapeared (second capture)

However, the book is visible in windows file browser (3rd capture)...

I don't understand and i don't know how to find the problem...

For information, calibre and the reader are up to date.

thanks for reading :)

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