product page BO / product page : attribute that can't be generated and don't work

[LaurentPres]

Hello,

I'm working on Prestashop 1.7.7.1 - FashionSEO theme

The site is under construction and will be launched with only 10 products. So I enter them manually.

It's a liquid product available in 5L, 60L, and 200L. -> Packaging attribute and the values 5, 60 and 200 (see screenshots)

When I made my first product sheet (two days ago), it was working on the back office and the front end.

Since then, I have created a second similar product with the same choice of packaging and I cannot generate my 3 attributes, nor save my modifications.

This also does in my first product sheet. In addition, they no longer appear in the back office but I find them in the front end.

I emptied my nav cache and tried in another. Nothing

I have emptied the Prestashop cache. Nothing

I deleted my existing attribute to make a new one. Following that I can not assign it to any of my two productions.

Do you have any idea where this might come from?

Thank you all in advance.