Sidebar Mystery

I’m using an iMac 27″ at my home office and a MacBook Pro 15″ on the road. For some reason when I open my WP.org Blo on my 15″ the sidebar has relocated itself to the bottom – as if there’s not enough room for it along the side. However… On my 27″ it looks as it should! (????)

Help…

M.Arcadi