As suggested…
I created a NEW Font Template “Test Roboto”


I switched Header and Body Font to the NEW Font Template “Test Roboto”
and Saved
On my Dev Site it load only 400 and 700 Roboto family fonts (and not ALL 100, 300, 400, 500, 700, 900 as requested):
<link rel='stylesheet' id='cs-google-fonts-css' href='//fonts.googleapis.com/css?family=Roboto%3A400%2C400i%2C700%2C700i&ver=2.1.3#038;subset=latin,latin-ext' type='text/css' media='all' />
Than, I switched back again to “Body” (Lato font) and “Headings” (Lato font)
switched Header to the Font Template “Headings” and Body Font to the Font Template “Body”
On my Dev Site it only load 400 and 700 Lato family fonts (and not ALL 100, 300, 400, 700, 900 as requested):
<link rel='stylesheet' id='cs-google-fonts-css' href='//fonts.googleapis.com/css?family=Lato%3A400%2C400i%2C700%2C700i&ver=2.1.3#038;subset=latin,latin-ext' type='text/css' media='all' />
Furthermore I still see wrong FONT WEIGHT names:


Just another thing:
On my Dev Site it load Lato fonts TWO TIMES:
at the beginning of source code (maybe from Inherit X Default font):
<link rel='stylesheet' id='x-google-fonts-css' href='//fonts.googleapis.com/css?family=Lato%3A400%2C400italic%2C700%2C700italic&subset=latin%2Clatin-ext&ver=1.2.3' type='text/css' media='all' /
>
at the end of source code (maybe from Font Manager Templates)
<link rel='stylesheet' id='cs-google-fonts-css' href='//fonts.googleapis.com/css?family=Lato%3A400%2C400i%2C700%2C700i&ver=2.1.3#038;subset=latin,latin-ext' type='text/css' media='all' />
Thank You