Garrbot's recent edits to Diver Down and Dead Synchronicity: The Longest Night (both of which I've made correcting edits on), which were attempting to add missing sys req tables, also added in a duplicate sys req header. Based on what I'm seeing, Garrbot doesn't currently check to see if it needs to add a sys req header when it notices missing system requirement table(s).
Topic on User talk:Garrett
Thanks for catching that, I was filtering based on the existence of the template ({{System requirements
) rather than the heading (==System requirements==
).