To combat spam, DokuWiki is by default configured to enable what it call Delayed Indexing. Delayed indexing basically try to delay indexing by search engines by adding noindex,nofollow robots meta tag to newly added and edited pages.

While this is useful to moderate spam edit of pages, it will cause the page to not be indexed by search engines, and all the links in the page will not be followed. This is a very bad scenario for SEO as not only the page will not be visible in search results but also the PageRank or link juice will not flow to other pages link from it. It will be disastrous if the page affected is the main page itself.

You can find the following meta tag when viewing the source of the page which indexing has been delayed. 

<meta name="robots" content="noindex,nofollow" />