Why Has My Theme Been Overwritten?

Hi there

I have recently set up a Worpress blog using a custom theme which worked just fine until a couple of weeks ago, but then it suddenly lost all of the settings for the formatting on the blog. The backgrounds and headers etc are still unchanged but all the fonts have been altered.

Is there something that I can do about this and does anyone know why it has happened?

I’ve also set up another 9 blogs in exactly the same way and they are all fine.

The blog is here – https://www.walking4weightloss.com/blog

Warmest regards

Jago