Grid : Columns size problem


Sorry for my bad english, it’s not my native language :zipper_mouth_face:

I’ve a problem with columns size when I nest a Div grid into another a cell of a parent grid :
The columns size didn’t match the columns size of the parent grid even if they having the same size (1fr) and the same gutter size

Here’s some screentshot of what I meam :

Anyone can help me on this subjet ?

Thanks in advance :grinning:

Here is my site Read-Only: