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When you use relative links such as this one they will be resolved by the browser based on the current page you are on. For example if I am in Generic Content module and edit a content item my current path is ~/Sitefinity/Admin/Modules.aspx and the relative link will be resolved based on this path. Thus when previewing the content item the link will appear to be such. However in the content itself the link will not be changed. This behavior is not coming from the editor or Sitefinity. You can use our link manager to include relative links to ensure that the relative paths are resolved as they should be.
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