disappearance of all my cells in my pivot table

Hello everyone,

Today, I wanted to reopen an Excel file that was not that old (1 month). However, all leaves are doing well except one. She decided to no longer display anything, no box, no cell. The lines are not hidden, nor colored, nor frozen, nor anything. I just don't understand. I'll give you a photo of the page as I see it. Your help is precious.

Regards, 

Jules