The password list position is not retained between characters when entering the wireless network password.  Remembering, in my experience, appears to be a fairly wide standard and makes it easier to enter passwords that use blocks of similar characters - i.e. a few upper, then a few lower, then a few numbers, etc.  Since numbers and lower case letters are essentially where it flips back to now those are easy but I can't recall another device that didn't remember, off hand, so it seems to be against common expectations.