Domain name hacked?

On AWSTATS referring sites statistics I noticed referring URL pages links using my domain name with a mail prefix. I thought that was a subdomain?
If you click on the page (s) with the prefix you are taken to that page which is identical to my site page minus the prefix.

In safari the url shows a padlock indicating secure. My site is https and the domain is both http and https.
ICANN does not recognize the domain. But mine is registered with identity hidden.

My site is a hobby business and no transactions take place on it.

Has anybody experienced anything like this? I am not sure what this accomplishes for someone to undertake this?

FlyingCamerasllc.com is my site.

Rich

Nothing to worry about. The mail dot domain is common. And it’s used if I’m not mistaken amongst other reasons for mx records that shouldn’t point to your domain dot com.