diff --git a/apps/Frontend/src/pages/claims-page.tsx b/apps/Frontend/src/pages/claims-page.tsx
index f58ee752..5528d15e 100755
--- a/apps/Frontend/src/pages/claims-page.tsx
+++ b/apps/Frontend/src/pages/claims-page.tsx
@@ -143,10 +143,12 @@ export default function ClaimsPage() {
       // CCA result: pdfFileId is already saved by the processor — open preview directly
       if (jobResult.pdfFileId) {
         advanceAiClaimQueue();
-        advanceChatbotClaimQueue();
-        setPreviewPdfId(jobResult.pdfFileId);
-        setPreviewFallbackFilename(jobResult.pdfFilename ?? `cca_claim_${jobResult.claimNumber ?? "unknown"}.pdf`);
-        setPreviewOpen(true);
+        const advancedToNext = advanceChatbotClaimQueue();
+        if (!advancedToNext) {
+          setPreviewPdfId(jobResult.pdfFileId);
+          setPreviewFallbackFilename(jobResult.pdfFilename ?? `cca_claim_${jobResult.claimNumber ?? "unknown"}.pdf`);
+          setPreviewOpen(true);
+        }
         dispatch(setTaskStatus({
           key: "claimSubmit",
           status: "success",
@@ -336,7 +338,9 @@ export default function ClaimsPage() {
 
   // Advance the chatbot_claim_queue / chatbot_check_claim_queue after selenium PDF is saved.
   // NOT called from closeClaim — called only after the selenium job completes and PDF is downloaded.
-  const advanceChatbotClaimQueue = () => {
+  // Returns true if it navigated on to another queued patient (caller should skip the PDF
+  // preview popup in that case — the form is about to be replaced by the next patient's claim).
+  const advanceChatbotClaimQueue = (): boolean => {
     try {
       const raw = sessionStorage.getItem("chatbot_check_claim_queue");
       if (raw) {
@@ -369,7 +373,7 @@ export default function ClaimsPage() {
             window.dispatchEvent(new CustomEvent("chatbot:eligibility-prefill"));
             setWouterLocation("/insurance-status");
           }, 500);
-          return;
+          return true;
         }
         sessionStorage.removeItem("chatbot_check_claim_queue");
       }
@@ -403,11 +407,13 @@ export default function ClaimsPage() {
           setTimeout(() => {
             setWouterLocation(`/claims?newPatient=${next.patient.id}`);
           }, 500);
-          return;
+          return true;
         }
         sessionStorage.removeItem("chatbot_claim_queue");
       }
     } catch {}
+
+    return false;
   };
 
   // Advance the ai_claim_queue by removing the first item (current patient).
@@ -447,10 +453,13 @@ export default function ClaimsPage() {
     const data = await res.json();
     if (!res.ok) throw new Error(data?.message || "Failed to save claim");
     queryClient.invalidateQueries({ queryKey: QK_CLAIMS_BASE });
-    if (!isDraft) {
-      advanceAiClaimQueue();
-      advanceChatbotClaimQueue();
-    }
+    // NOTE: advanceChatbotClaimQueue() is NOT called here. This function only creates
+    // the claim DB record; for selenium-based insurances (MH/CCA/DDMA/Tufts/United) the
+    // actual submission + PDF happens afterward. Advancing the queue here would move to
+    // the next patient before the current patient's selenium job (and PDF) finishes.
+    // The queue is advanced later, once the selenium job completes (see
+    // handleMHSeleniumPdfDownload and the CCA branch in the job-status useEffect).
+    if (!isDraft) advanceAiClaimQueue();
     return data;
   };
 
@@ -964,13 +973,15 @@ export default function ClaimsPage() {
         duration: isPreAuth ? 10000 : 5000,
       });
 
+      let advancedToNext = false;
       if (!isPreAuth) {
         advanceAiClaimQueue();
-        advanceChatbotClaimQueue();
+        advancedToNext = advanceChatbotClaimQueue();
       }
 
       // Pop up the final PDF so the user doesn't need to navigate to Documents
-      if (result.pdfFileId) {
+      // (skip if we're about to navigate to the next queued patient's claim)
+      if (result.pdfFileId && !advancedToNext) {
         setPreviewPdfId(result.pdfFileId);
         setPreviewFallbackFilename(result.fileName ?? null);
         setPreviewOpen(true);