Line 193: ID "Third-party_developers" is already defined here:
<span class="mw-headline" id="Third-party_developers">Third-party developers</span>
These redirects have more than one link. This causes problems with WhatLinksHere since it does not determine redirects, instead listing backlinks which are also redirect pages.
Viewing 22 redirects120 anchor found in Video game developer of which 86 were not produced by cite.php