Hi there,
Don’t know what’s the issue on your clients pc as it loads perfectly on our end. I think there’s issue with your clients pc. Ask your client to remove any unwanted extensions & then try to load the site. Sometime for the bad internet the font is not loaded. Please check whether your client is having bad internet or not. It’s definitely fault with your clients pc as there are no issue with theme as I can see.
Thanks & Best Regards