Raleway Google font not rendering due use of font-name variants

Hi there,
In summary, the problem we have is that we are using the Raleway Google Font, which is implemented as font-family: Raleway with different font-weights, but the rich text editor is setting the font-family as ‘Raleway Medium’, ‘Raleway Light’ etc, which are not implemented in the Google API font.
We have the Raleway font defined in functions.php as follows:

function avia_add_heading_font($fonts){
$fonts['Raleway'] = 'Raleway:100,200,300,400,500,600,700,800,900';
return $fonts;
}

And indeed, this results in:

<link rel='stylesheet' id='avia-google-webfont' href='//fonts.googleapis.com/css?family=Raleway:100,200,300,400,500,600,700,800,900' type='text/css' media='all'/> 

The font shows up in the enfold child settings, and consequently it is used across the site by default. But, when editing various text boxes through avia, there is an inline font-family added. For example, on this page, we find:
<span style=”font-family: ‘Raleway Medium’;”>Who we are…</span>
But Raleway Medium is not defined in the Google font CSS.

Is there a way to change this behaviour, and have the content editor specify an inline font-weight? Where are those inline definitions coming from?

We could use a different version of Raleway (not served from Google), but we would have to do that in addition to the Google font, since we do have certain styles (correctly) defined using font-weight:400 and the like

For now we have implemented a fix where we define the unique font face name (Raleway Medium, Raleway Light etc.) in style.css, referencing the same Google font asset. But, for some reason, this only works in Chrome, not Safari.

@font-face {
  font-family: 'Raleway Medium';
  font-style: normal;
  font-weight: 500;
  src: local('Raleway Medium'), local('Raleway-Medium'), url(https://fonts.gstatic.com/s/raleway/v9/CcKI4k9un7TZVWzRVT-T8wzyDMXhdD8sAj6OAJTFsBI.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2212, U+2215, U+E0FF, U+EFFD, U+F000;
}

Please advise.