Knowledgebase articles are not separated by category in URL
Modules Category
https://www.gmodstore.com/help/addon/5772/modules/secondary-usergroups-1
Developer Information Category
https://www.gmodstore.com/help/addon/5772/developer-information/secondary-usergroups
Problematic URL
https://www.gmodstore.com/help/addon/5772/modules/secondary-usergroups (this shows you the article called Secondary Usergroups in the Developer Information category)