Sorry, sent to much messages and i got blocked for today.
I tryed with /img/favicon and img/favicon its same-same. Image on main page but not elswhere. Therefore must be similar issue than at the css file.
FIXED It !
Atm using:
<link rel="stylesheet" href="{{ `css/styles.css` | relURL }}">
<link rel="shortcut icon" type="image/png" href="{{ `/img/favicon.png` | relURL }}">
<link rel="shortcut icon" sizes="64x64" href="{{ `/img/favicon.png` | relURL }}">
<link rel="apple-touch-icon" href="{{ `/img/favicon.png` | relURL }}">
Atm removing the duplicate header and then its golden. Brb 
FIXED that to!
A HUUUGE and honest thank you for you guys! I got messed up to much after 6days on this problem only. I would never found it by my self. REALY thank you !