I've riced my Ubuntu Server using dwm and st, using LibreWolf as my web browser. It's a very minimal build, I installed the Roboto Mono font and the Linux Libertine and Biolinum fonts, and Ubuntu Server already comes with the Deja Vu fonts.
My web browser isn't correctly dispaying fonts, all fonts in the viewport are the same (I believe they're Deja Vu Sans). This gets clear when I visit Google Fonts (image below):
Fonts on Google Fonts displaying incorrectly
All fonts are displayed with the same font.
Do I need to install any packages or configure fontconfig in any way to make fonts work as intended in my browser?
Edit: as requested by @kanehekili, here it is my fc-list output: https://pastebin.com/raw/EZXjpZmu