Conflict with SEO Suite extension
If you are using Improved Layered Navigation and have SEO suite installed, please open file app/code/local/MageWorx/SeoSuite/etc/config.xml and remove these
and these lines
Then clear cache. You might also want to enable Magento advanced search extension. This way you will optimize in-store search results for.
See more details on Improved Layered Navigation page
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