Problem with widgets/columns in Brunelleschi theme

My site is http://lifestyleflash.com/.

I’ve just switched layouts (from having one side-column on the left to having one on each side of the body) and as you can see for some reason one of these columns is actually sitting underneath the body of my blog, above the footer.

I’m presuming one of the columns may be too wide but this is an uneducated guess!

Another thing I’m not sure of is which widget area is which – this layout has 4 and I’ve tried moving my widgets to each but it makes no difference and in fact they don’t appear to move at all. I’ve tried leaving for a while as WordPress does seem slow to show my edits these days but that doesn’t make a difference either.

I’m scratching my head a bit here and can’t find any similar forums/posts within support. As I’m not very CSS/html-literate any plain English advice that helps with fix this would be very much appreciated! Thanks in advance.