I have created my site using geeklog, but there is a small problem with meta tags - not all pages display the description. Where can I find the error?

If you are talking about Staticpages then you need to edit the page where you can then add meta keywords and descriptions.

Other pages not directly editable like search pages either use the default meta tags setup in the Geeklog configuration or none at all.

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One of the Geeklog Core Developers.