I checked the error log. and found the following error on the three web pages.
"SELECT wp_posts.ID FROM wp_posts WHERE 1=1 AND wp_posts.post_type = 'post'"
Someone is testing vulnerabilities the the website. we are very glad.
If you found vulnerabilities about "http://tetraph.com". Please tell us.
If you agree, we can have a hall of fame list. Though the website is not famous.
We still want to show respect to guys helped us.