I need to request temporary access (wp-admin and FTP) to your site—preferably to a test site where the problem has been replicated if possible—in order to be of better help. When you log in to leave your next reply, you will find the needed fields below the comment area. The information you will enter is private, meaning only you and I can see and access it.
I have reviewed your website along with the screenshots you provided.
It looks like the custom fields were configured after you initially tried to translate the page, which is why they did not appear in the translation editor.
To refresh the translation, I made a small change to the post content and updated the page. After that, I opened the translation again, and the remaining custom fields appeared correctly.