Non-existent anchors are marked with [Invalid]. These redirects can be retargeted to the correct section or by adding an anchor to the page (e.g.
== Other related media <span id="Video games"></span>==). Incorrect redirects are sometimes caused by bots fixing double redirects.
Formation_of_sea_ice is somewhat similar
Viewing 17 redirects160 anchor found in Sea ice of which 102 were not produced by cite.php