diff --git a/apps/as/src/pages/instl-sncn/ui/cnfm-regist-page.tsx b/apps/as/src/pages/instl-sncn/ui/cnfm-regist-page.tsx
index 97fc032e7..b3414a652 100644
--- a/apps/as/src/pages/instl-sncn/ui/cnfm-regist-page.tsx
+++ b/apps/as/src/pages/instl-sncn/ui/cnfm-regist-page.tsx
@@ -162,11 +162,34 @@ function CnfmRegistPage() {
   useEffect(() => {
     setCheckResults((prev) => {
       const next: Record<string, CheckResultVal> = {};
+      let changed = false;
+
       cklstRows.forEach((row) => {
         const key = cklstKey(row);
-        next[key] = prev[key] ?? null;
+        if (Object.prototype.hasOwnProperty.call(prev, key)) {
+          next[key] = prev[key];
+        } else {
+          next[key] = null;
+          changed = true;
+        }
       });
-      return next;
+
+      // 기존 key가 사라졌거나 값이 달라진 경우만 상태 업데이트
+      if (!changed) {
+        const prevKeys = Object.keys(prev);
+        if (prevKeys.length !== Object.keys(next).length) {
+          changed = true;
+        } else {
+          for (const key of prevKeys) {
+            if (!(key in next) || prev[key] !== next[key]) {
+              changed = true;
+              break;
+            }
+          }
+        }
+      }
+
+      return changed ? next : prev;
     });
   }, [cklstRows]);