I have 6.5.4 (6.5.4.4720 to be exact) and it just started doing this today.
When I am typing in a note and the system autosaves, the cursor jumps to the top of the note but in the title area, not the note field.
This is the first day I've notices but it's also the first day in several weeks I've sat down with Evernote and dumped in a bunch of text notes.