Which is your network? Is it "hidden"? This is no advantage for network safety, better broadcasting the ESSID and using a fixed channel.
14 channels?! Which country do you live? 14 are normally for Japan. For example, here in Germany it is 13. Please try:
Check again with "iwlist chan".Code:sudo apt-get install iw iw reg get sudo iw reg set DE iw reg get
Replace DE for Germany with your country.