something bizzare with editors
 

My editors have changed but I don't know how to change them back.

They are the same for - memberpages and - social groups (using AP...)

also the box size itself, in which a user can type, is a bizzare shape ....

Try disabling your plugins and see if they go back to 'normal' (although they look fine to me...)
Note: To temporarily disable the plugin system, edit config.php and add this line right under <?php