Where does the font bug in Firefox come from?

Question

css

Comrades, colleagues!
Adding the SansationRegular font to the page. Embed code:

@font-face {
    font-family: "SansationRegular";
    src: url("fonts/SansationRegular/SansationRegular.eot");
    src: url("fonts/SansationRegular/SansationRegular.eot?#iefix")format("embedded-opentype"),
    url("fonts/SansationRegular/SansationRegular.woff") format("woff"),
    url("fonts/SansationRegular/SansationRegular.ttf") format("truetype");
    font-style: normal;
    font-weight: normal;
}

I work on a Linux machine and all fonts of this family (bold, light, italic), including regular, are displayed with a bang:
joxi.ru/krDjJ6PhE5W302
joxi.ru/vAWLbJkh1EayKr
My colleague's Windows machine ) it is displayed like this:
joxi.ru/DmBqKREt9E1xrP
joxi.ru/Q2KGkqxcn5GR2j
Moreover, this font with the property is displayed normally (heading Samson LLC). Maybe someone knows or faced with such a problem and can suggest a solution. font-weight: bold;

Answer 1

Faced such a problem. Some of the formats that are displayed on Windows are not calibrated for all sizes. Changing the font or changing the size of the text by a couple of pixels here and there will help until it's ok.
In my case, the problem was in woff2.

Answer 2

I suggest commenting out loading fonts in different formats one at a time and at each step look at the result on both OSes to find out which OS actually uses which format. I assume that the point is that different formats look different (I know that it should not be so, but still), and not that different OSes display one format differently.

Answer 3

In what a problem is clear - in a hinting. But how to fix it is more difficult.
Fonts, I suspect, are made by the FontSquirrel converter, and he sins with such things. And it is not clear how to fix it - I experimented with its options, went through a bunch of options, and in some cases I could not fix it with any combination of options.
Try alternative fonts whenever possible from Google Fonts and from Fontstorage.com