I hope at least a few people have this issue. Since updating to Mavericks I've found the notes app is totally non-reliable. I usually have ONE note and its reserved for remembering certain things like my door access code to home, random key things. Those are static. The rest of the note is reserved for writting down groceries or stuff I need to buy that changes daily so I don't forget. When an idea comes to me I whip out notes and write it down. Until mavericks it would update flawlessly across all devices. Update on any and all are updated in turn. Now I update something *anything* on my rMBP or any device and it creates a totally new note for it every single time upon syncing. So say I simply add "rice" then the original note stays the same without rice, it will then create a 2nd note on the devices the same as the original but with "rice" added. And so on and so forth. I should note the "mother note" is on the rMBP and it always stays the same and updates. But on the associated devices like iPhone, iPad etc it creates new notes. I've tried wiping all notes and starting from scratch but it just happens again.