Mystery website

Hi all,
I am not sure what is causing this. But I am running ghost blog on the following domain: https://blog.flydocs.de . But for some odd reason when you google “Flydocs Blog”, one of the first hit is some website called umanes.com and it is somehow pointing to my blog. See the snippet below:

I pinged umanes.com and it is showing the same ip addresss as the ip address of my blog. So blog.flydocs.de is pointing to an ip address and umanes.com is pointing to the same ip address. This can be due to the shared hosting. I am using Digital Ocean with a shared CPU. But what I do not understand is that why this domain is showing the content of my website?? In fact, google says that this website umanes.com was indexed 10 years ago. I do not understand why all of a sudden google has indexed my website results to this website. I was hoping someone could help me solve this mystery.

Thanks a lot in advance.

Regards,
Thomas