My GMod font randomly changed

I just launched Garry’s Mod (bought on Steam) and I noticed that the font changed to a really thin font. It looks like the font in “C:\Program Files (x86)\Steam\SteamApps\common\GarrysMod\garrysmod\resource\fonts” called Roboto-Thin. I’m not sure what happened. I haven’t installed any custom fonts. It’s extremely hard to read. Any help is appreciated.

Do you happen to alt-tab or minimize GMod while it’s loading?