We've imported a blog from one domain to another and the permalink thats been created for category archives is: domain.com/category/graphic-design-blog/tips-for-artist/ where category/graphic-design-blog/ is superflous.
The permalink structure is set to the default (2011/10/post-name) and this is working fine for single posts.
Yoast's WP SEO plugin is installed, but there are no changes made under the permalink section of the plugin.
Any suggestions as to why this is happening / how I can fix it?
Thanks, Tim