My notes are deleted automatically, I recover them and after a while they are moved again to the trash folder

I just discovered that today, while organizing my notes, I couldn’t find some of them and went to the trash folder where I found many of them that I don’t remember to have deleted them, because they are part of my personal records… anyway, I recovered them and after a couple of minutes the notes moved again to the trash folder! If I recover them again, after a while they go back to the trash…

I’m worried, I don’t know if Apple knows about this bug but if I can’t relay on my notes system, where many personal information is stored, then it’s useless… any idea of why this is happening?