Editbox is out of proportions

[interium]

My editbox is out of proportions. Have a look at the screenshots.

The text in the thread is wrapped in the same way as the text in the editbox. A phew words then next-line.


Bugged edit box: http://grab.by/2yGQ
Finished result: http://grab.by/2yGP

Editbox from vbulletin.com: http://grab.by/2yGW (like it should be)
Finnished result should be like this: http://grab.by/2yGS (edited)

vB 4.0.1. I have edited the default template with new images only. No plugin caused this.
How can I change this?