Typey Box Thingy Problem?

Whenever I try to make a post on my forums, and hit preview, in the box where I type everything (with BBCode), it changes all the text in to HTML. I know barely any HTML, but enough to work around this. But I'm not sure if my members know HTML. It's also really annoying.

So, this:

Code:

[i]Example[/i]

Turns in to this:

Code:

<i>Example</i>

HALP

Hit the a/A button & then try it.

You mean the button that adjusts the size of the text?

...that just adjusts the size.

Or do you mean something on the ACP?

Nopes, the button on the extreme right top where you type your post.

That just makes text bigger and smaller... right?

Could it be the WYSIWYG option? I'll try turning it off and posting.

EDIT: Ok. That fixed it.

Solved.