404 Error

Actual website link:

A user tried to go to https://www.cheapghd.com.au/www.cheapghd.com.au/http:/www.cheapghd.com.au/wp-comments-post.php and received a 404 (page not found) error. It wasn’t their fault, so try fixing it. They came from https://www.cheapghd.com.au/www.cheapghd.com.au/http:/www.cheapghd.com.au/wp-comments-post.php

I get several errors similar to this. I have tried posting comments etc to replicate the fault but I cannot. Because the wp-comments-post.php is not an actual page.

It happens at least once a day. So I do not think it is related to the search bots.

Thank you so much for your help ??