When I open a new Post or new Page in the admin side…HELP!!

I was installing a new simplyhired plugin, and when I went to post a new page on the administrator’s side, the “New Page” page was to the left, like in the image. Also the “New Post” is the same, is all to the left. Everything else is fine.

I uninstalled what I did, but still the same.

I am not sure how to fix this issue. any help?

https://i876.photobucket.com/albums/ab321/howmanyjobs/wordpress-something-is-wrong.png