Products cards/picture do not appear in collection page until I refresh the page

[OhMyGodZ]

Hello,

Disclaimer: My website is a loveshop, if you are not confident with this kind of product, do not visit the website.

On my website (https://ohmygodz.fr/), when I am going to a collection page some products (usually the first row) do not appear until I refresh the page.

I read different topics and try to add so additionnal code but nothing worked. Does someone has a solution for that ? 

Thank you by advance 🙂