Link spam appears in mobile site

Hello. Firstly, fantastic theme. Thanks a lot

I’ve noticed a problem with the mobie version of my site – it includes a mysterious link at the very bottom of the site: “https://ajleeonline.com” which directs to some online casino outfit.

What’s going on here? I can’t find any reference to that in the site code. It looks like spam. How’s it getting there? Any ideas?

Thanks