Website cloned my entire website?

Hi, all. This is pretty weird.

I run www.sleepypeach.clothing. A few days ago, I checked my Facebook pixel and realized that another website, www.tremsline.com was using it. Upon checking that website, I realized that it had completely cloned my website, down to the pixel.

I checked and their cart function doesn't work. There are a few custom things I added to my website that they were unable to duplicate. I also disabled my pixel from their end. Still, what is the purpose of cloning an entire website? How did they do it?