This has been driving me mad lately.
Desktop version of Evernote
If I am typing in the application, without the note popped out into its own window, then the problem I am about to describe doesn't happen. It only happens if I have the note popped out into its own window. As I am typing, randomly, and frequently, the cursor automatically jumps up to the start of the title. So all text I am typing start becoming prepended to the title. This is so aggravating. I have been able to determine no rhyme or reason. I have even very systematically slowly typed trying to see which key or combo does it, I can literally sit and keep pressing f or g and within a few seconds the cursor will jump to the title.
Evernote is this only app this happens in. It also only happens on notes that are in their own windows.