Brave and Chrome have reverted to using Roboto Thin which is almost unreadable

Brave and Chrome have reverted to using Roboto Thin which is almost unreadable.

Just lately the fonts have switched for some reason and now when I open Google sites such as YouTube etc. the font used is Roboto Thin which on my 2k display is so thin it is almost unreadable. Please see photo. https://ibb.co/bz0Hfgr

Is there any way I can get the browser to use a different font instead of this one?

Thanks.