I am hoping this is the right forum to ask this question. But, I was looking at my backlinks and noticed that I had some go to a page that resembles my site, but had porn words on it. however, it would link to a place on my site. Under more information it has a real link to my site. What is this? I noticed the domain authority was in I believe the 70's; but PA was in 40's. I am new, so can someone explain this. Thank you.
example below:
