diff --git a/front/assets/js/test_results/components/test_explorer.tsx b/front/assets/js/test_results/components/test_explorer.tsx
index 79100b693..639ea4979 100644
--- a/front/assets/js/test_results/components/test_explorer.tsx
+++ b/front/assets/js/test_results/components/test_explorer.tsx
@@ -129,7 +129,8 @@ const FilterInfo = (state: { suites: types.Suite[], filteredSuites: types.Suite[
     return sum.add(suite.summary);
   }, types.Summary.empty());
 
-  const filteredSuiteSummary = filteredSuites.reduce((sum, suite) => {
+  // We need to use cloneDeep because syncSummary mutates the suite
+  const filteredSuiteSummary = _.cloneDeep(filteredSuites).reduce((sum, suite) => {
     suite.syncSummary();
     return sum.add(suite.summary);
   }, types.Summary.empty());
diff --git a/front/assets/js/test_results/types/suite.ts b/front/assets/js/test_results/types/suite.ts
index 20c6c53fd..c295bea48 100644
--- a/front/assets/js/test_results/types/suite.ts
+++ b/front/assets/js/test_results/types/suite.ts
@@ -55,7 +55,7 @@ export class Suite implements Stateful {
 
   syncSummary() {
     this.summary = new Summary({
-      duration: this.tests.reduce((duration, test) => duration + test.duration, 0),
+      duration: this.summary.duration,
       total: this.tests.length,
       failed: this.tests.filter(test => test.state === State.FAILED).length,
       passed: this.tests.filter(test => test.state === State.PASSED).length,