Doesn’t download greek-ext subset

On a multilingual multisite it works fine on the English and German sites, i use the Roboto family(Condensed, Slab etc..)
But in Greek site the greek-ext subset is missing, i think it is not downloaded at all.
What can i do?

This is the style used by my theme now, without CAOS:
https://fonts.googleapis.com/css?family=Roboto+Condensed%3A700%2C400%7CRoboto+Slab%3A700%2C400%7CRoboto%3A400&subset=greek-ext%2Clatin%2Clatin-ext&ver=1551105697