showing only one thumbnail

Hello,

the plugin only shows one product, not the number I set up,
when the page is loading, at first i can see several products, but then the page complete loading and it shows only one.
probably something in the CSS, but I don’t know what.
Could you help me fix this?

you can see the page here : http://minirosa.net/

Thank you
Vincent

https://wordpress.org/plugins/wpb-woocommerce-product-slider/