CSS grid, flex-box

Hi, I just wanted to know why when I uploaded the first and second time my proyect, the Github Page didn't recognise the font-face property. I had to dragged my folders (I didn't use this time git) and finally, the web changed the font-family to the correct instead of the predeterminated one. It is something for not using git? Or it just a problem of Github that doesn't upload the font-family files?