The "Your Site on Google" feature in Google Webmaster Toolsis designed to provide website owners with information about how their site is performing in Google search results. However, there are several reasons why this feature may not always provide accurate information about search positions.

Firstly, it is important to understand that search rankings can fluctuate frequently and can be influenced by various factors such as changes in Google's search algorithm, competitor activity, and user behavior. As a result, search positions reported by Google Webmaster Tools may not always align with the actual positions in real-time search results.

Secondly, the "Your Site on Google" feature uses an average position metric that is calculated based on the search queries that triggered the display of the website in the search results. This means that the reported search positions are based on a subset of search queries, rather than all possible search queries. As a result, the reported search positions may not accurately represent the site's overall performance in search results.

Thirdly, the "Your Site on Google" feature uses data from the Google Search Console, which may not include all search data. For example, search data from users who are not logged in to their Google accounts or who are using private browsing mode will not be included in the Search Console data. This means that the reported search positions may not accurately represent the site's performance for all users and search queries.

Lastly, it is important to note that the "Your Site on Google" feature is designed to provide website owners with a general overview of their site's performance in search results. It should not be relied on as the sole source of information about search rankings. Instead, website owners should use other tools and methods to track their search rankings and performance, such as third-party rank tracking tools or manual search result monitoring.