diff --git a/tools/challenge-helper-scripts/create-project.ts b/tools/challenge-helper-scripts/create-project.ts
index cca47a0cd3d..2a54801cb43 100644
--- a/tools/challenge-helper-scripts/create-project.ts
+++ b/tools/challenge-helper-scripts/create-project.ts
@@ -86,7 +86,8 @@ async function createProject(projectArgs: CreateProjectArgs) {
     }
     void updateChapterModuleSuperblockStructure(
       projectArgs.block,
-      { order: position, chapter, module },
+      // Convert human-friendly (1-based) position to 0-based index for insertion.
+      { order: position - 1, chapter, module },
       superblockFilename
     );
   } else {