Hello Ismael,
Thank you very much for your help.

1/ the code is a shortcode :

[best_selling_products limit="4" column=”4″ paginate=”true” orderby="rand"]

I understand it’s not your work, but don’t you have any clue why this ? :) :) :)

2/ About the shop.
from my side, it seems broken :(
See the screenshot :
https://prnt.sc/Xq1btq048aRl

And all the images are uploaded with the same size .

I can even pay you, if needed, in order to solve this 2 issues :)

Please help,
Greeting,
Johan :)