diff --git a/src/pages/api/assignments/[id]/export.tsx b/src/pages/api/assignments/[id]/export.tsx
index 5d8a3397..d38be031 100644
--- a/src/pages/api/assignments/[id]/export.tsx
+++ b/src/pages/api/assignments/[id]/export.tsx
@@ -154,9 +154,10 @@ async function post(req: NextApiRequest, res: NextApiResponse) {
 					return {...e, bandScore};
 				});
 
-				const moduleResults = data.exams.map(({module}) => {
+				// in order to make sure we are using unique modules, generate the set based on them
+				const uniqueModules = [...new Set(flattenResults.map(item => item.module))] as Module[];
+				const moduleResults = uniqueModules.map((module) => {
 					const moduleResults = flattenResultsWithGrade.filter((e) => e.module === module);
-
 					const baseBandScore = moduleResults.reduce((accm, curr) => accm + curr.bandScore, 0) / moduleResults.length;
 					const bandScore = isNaN(baseBandScore) ? 0 : baseBandScore;
 					const {correct, total} = getScoreAndTotal(moduleResults);