All my links has redirect text linksredirect

Hi,

I am not sure why all my links in my webpage has linksredirect url as shown below.

Could you please let me know how to disable this? I have not installed any plugins like bidvertiser, viglink, infolink etc.

https://linksredirect.com/?pub_id=6632CL6242&url=http%3A//frontierinternet.org/

Thanks!