problem with drafts, please help!

sooo... idk if anyone else has this problem, but it's really weird.  my drafts automatically delete themselves?  idk why, and it's kind of hard to explain.  if i save something as a draft, sometimes i can save more than one, but sometimes if i try to save another one it replaces the first one.  if i do it a certain way, i can save all of them, but then i go back a few hours later and instead of 5 drafts, there's 2.  wtf is that about??  is there any way i can fix that?