Notes keep dissapearing on iPhone!?

Hi folks, so for the last few weeks, my Notes have been disappearing from my iPhone. It began happening with my iPhone 3G, and now happens with my iPhone 4. I am truly puzzled by why this is happening. I use the Notes app to store certain info. & it would be great if they didn't delete themselves. I also notice that since this started happening, I've been getting every Note I create in my email, seemingly after it deletes itself from my phone. I'm sure this will be something very stupid that I'm missing, but is there a setting I accidentally turned on or something? Or is this an actual bug? Thanks guys