info under post disappeared! (comments, author info, related posts..)

Hi, guys
I don’t know why but all the info under my post just disappeared! It includes the option to comment, the pic of the author, related posts, all those stuff. I already double checked if everything is set to display it and it is! It doesn’t show on the main page with the posts, but if i click on a single post to show, the info appears! I don’t really know why it is happening!
I didn’t change anything on the css either!
HELP!
thanks a lot!

ps. and it also used to appear the option to comment just on the top of the posts title and it vanished