Another Cover Question

Hello all, yes another cover question :)

Device : Kindle Touch ( 5.1.0 )
Calibre : 0.8.50

I had a lot of epub with cover page inside, when convert and tranfer to kindle if i open the book and tap to menu and goto cover i see the image.

But while im at main menu ( list all books ) when do a long tap over the book to see info about the book i see a generic kindle image as cover.

Any ideas? sorry about my bad english is not my primary language.

Thx a lot