Edit page/post box empty

I had earlier broken tables issue but I managed to fix it. Now it appears that if I try to edit post/page then this edit post appears empty.

In example https://blog.pere24.ee/reklaam/ edit page screenshot is https://www.dropbox.com/s/318ogs3iucv343h/empty_post_edit.PNG

In some moments it is possible to edit it in text version but if i click visual editor and back to text editor then it is empty again ??