Blog title and comments are returning 400 bad request

My blog page is https://howtobelovely.com.au/blog. When I click on the title or the comments it comes up 400 bad request. (for the record it also doesn’t allow me click on the read more link if I add that) I have changed the permalink structure but I also fixed the htaccess file. I am a real novice at this please any help would be greatly appreciated.