Products sorting issue

[facem]

Hi,

I'd like to sort my products, change their position, but the PS solution for don't work.

Prestashop version : 1.7.5.1

Host : VPS debian 9

I moved the products in BO with the drag'n drop, saved :

But in frontO, nothing changed :

I've tried to clear the cache, but it's stull the same.

If someone have some clues about it.

Thanks