Hi @Jean Dolphin
Does this issue occur with other documents?
I suggest you backup your file first.
Then try to just select the objects from one page to unlink fields item (Ctrl + Shift + F9) for a test.
Besides, please go to View tab > Outline, switch to outline view to check this issue.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.