I had the 10.3 version in the moment that I've created the notes. I entered the iOS application settings and started the manual synchronization and it seems that the notes have appeared. if anyone still has this problem for iOS maybe this option will help them.
There is any way to recover the notes that wasn't saved even if I've clicked the checkbox before close the app? I lost two notes in this way. I think to change to another app because it seems impossible for such a large company to play with users data.