Vertical book grids on book pages

I got a issue with the book grids on book pages (on normal pages it works good): it is vertical and bugged instead of horizontal.

You can see the issue here:

https://redclimber.it/book/appennino-di-neve-e-di-ghiaccio/ (only vertical)
https://redclimber.it/book/appennino-neve-ghiaccio-vol-2/ (vertical and bugged)

Thanks for help