Hi Paulo P,
Thank you very much for your help. I used WP Staging as you noticed and I desactivated my plugins one by one… until I discovered the issue comes from the “Woo Product Category Discount Pro” plugin.
That’s now working, even if I can’t use that plugin anymore… I don’t know why this plugin causes that issue but that’s another subject.
I don’t know if I have to create another post but I have another issue linked to that. For variable products, when all the variations have the same regular price and promo price, only the promo price is shown in the front end. However, it is enough that a variation has a regular price or a promo price different from the others for the whole to be displayed. Is this a normal operation of Woocommerce?