Well, using Chrome, I saw the initial problem straight off.
I then right clicked on the slide (which was half out of view), then selected "Inspect Element".
This opened up Chrome's Dev Tools with a <div class="span7"> highlighted.
This just seemed to be the text within the slide and there weren't any suspicious styles attached to it.
(you should be able to see the styles associated with a particular element on the right hand side of the Dev Tools when the element is selected).
I then selected the element's nearest sibling (<div class="span2">) by clicking on it from within the Dev Tools.
This seemed to be the picture and was equally as unsuspicious.
I then selected the parent element of <div class="span2">, which was <div id="eng1stSlide" class="item active">.
This seemed to be the slide container. That's when I saw the negative margin being applied to the class "active".
I removed that rule from within the Dev Tools (just remove the tick next to the style) so as to make sure and Bingo!
As an additional tip (apologies if you know this already) - if you mouse over the various DOM elements from within the Dev Tools elements tab - the actual elements they correspond to are highlighted on the page.
Hope that helps.