Product gallery problem

Hi there,

This is a sample of product page of my shop under construction:
https://www.besbike.com/shop/ricambi-accessori/prodotto-di-prova/

I’tried different settings, but the product gallery doesn’t work like at the beginning.
The images i add as gallery images are wrong: are united without space between them.

i tried with virtue and original wordpress gallery, cropping or not images.