Permission page broken
I had exactly the same problem few days ago.
Do you have the devel module install?

For me it was the problem, i can't explain why but when i desintalled it, all worked fine.

So maybe, try to desactivate and unistall it and maybe your page permission will work again.

PS: i just re-install the devel module to make a test and i have exatly the same permission page than you. For me it's the devel module the problem. (I'm new in Drupal so i had certainly make a mistake somewhere)