Using Drupal (7.22) Kickstart (commerce_kickstart-7.x-2.6) and my hardly amended Kickstart Omega theme, I'm getting multiple breadcrumb displays like http://www.johnallsopp.co.uk/temp/drupalBreadcrumbs.png
Here's another http://www.johnallsopp.co.uk/temp/drupalBreadcrumbs2.png showing the View/Edit menu appearing twice, too.
As far as I can see it's only possible to put blocks in one region, so you'd think breadcrumbs would only appear once.
What do you think's going on here (and how do I fix it)?
(I'm proficient at HTML/CSS/PHP but I'm still getting up to speed with Drupal)