Problem with post pingback

Hi,

My website url is https://ipnrstatus.in. This is not a wordpress site. However I have setup a blog in this site which is a wordpress. Blog url is https://ipnrstatus.in/blog/.

I am not sending any post pingbacks to other websites. However there are lots post pingbacks are created with my site homepage. Here is an example page, https://knowledgenuts.com/2014/03/01/the-secret-egyptian-city-buried-in-the-california-desert/, where there is post pingback link to my site homepage. (knowledgenuts is a wordpress site. View the source code on the knowledgnuts to see a link to my site).

How can someone send a post ping back to other websites with my website url. There are so many links created like this on different websites with adult keywords.

Can someone please let me know how to fix this.