The output of the site search gives duplicates and the links to the post/pages give 404 errors. The url is also not pretty link anymore.
You can check it here:
I'm not sure what causes this problem (it's very likely not theme related because we just call the standard wp search function). Maybe a plugin causes this error. You can try this search plugin: Relevanssi - it will replace the standard search with it's own search engine which is much more powerful and accurate.
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