That's strange. Anyone have ideas as to why Safari reopens as fullscreen in some but not others systems? Closing Safari by command-Q or command-W makes it reopen non-full screen in my systemThis doesn't happen to me, when I close safari using cmd + Q and reopen, it automatically goes into full screen mode.
It will only open whatever your last window was but if you close this window before quitting it will open your home page in a small window only and not in full screen. There is no true way to make it open in full screen by default.This solved it for me too, thanks! I'm actually on El Capitan 10.1.13 right now.