[Chiuso] I get WPML warning about standard wordpress editor

I have started recieveing this warning when I want do edit posts.
Warning: You are about to edit your translation using the standard WordPress editor but your site is configured to use the WPML Translation Editor. Any edits you do here will be lost if you later open it in the WPML Translation Editor.

It's not always but sometimes, and I can't figure out why this is happening.