diff --git a/.last-branch b/.last-branch
index 9671641..d11047e 100644
--- a/.last-branch
+++ b/.last-branch
@@ -1 +1 @@
-v20260120-08-runchecks-link-existing-autotask-ticket
+v20260120-09-runchecks-modal-sequence-fix
diff --git a/containers/backupchecks/src/templates/main/run_checks.html b/containers/backupchecks/src/templates/main/run_checks.html
index 7eada09..fe1a50f 100644
--- a/containers/backupchecks/src/templates/main/run_checks.html
+++ b/containers/backupchecks/src/templates/main/run_checks.html
@@ -1014,12 +1014,27 @@ table.addEventListener('change', function (e) {
       if (btnAutotaskLink) {
         var linkModalEl = document.getElementById('autotaskLinkModal');
         var linkModal = linkModalEl ? bootstrap.Modal.getOrCreateInstance(linkModalEl) : null;
+        // Avoid stacked Bootstrap modals: temporarily hide the main Run Checks modal
+        // and re-open it when the Autotask link modal is closed.
+        var mainModalEl = document.getElementById('runChecksModal');
+        var mainModal = mainModalEl ? bootstrap.Modal.getOrCreateInstance(mainModalEl) : null;
+        var reopenMainAfterLinkModal = false;
         var atlSearch = document.getElementById('atl_search');
         var atlRefresh = document.getElementById('atl_refresh');
         var atlStatus = document.getElementById('atl_status');
         var atlTbody = document.getElementById('atl_tbody');
         var atlEmpty = document.getElementById('atl_empty');
 
+        if (linkModalEl) {
+          linkModalEl.addEventListener('hidden.bs.modal', function () {
+            if (reopenMainAfterLinkModal && mainModal) {
+              reopenMainAfterLinkModal = false;
+              // Re-open the main modal so the normal Run Checks workflow continues.
+              mainModal.show();
+            }
+          });
+        }
+
         function renderAtlRows(items) {
           if (!atlTbody) return;
           atlTbody.innerHTML = '';
@@ -1114,6 +1129,12 @@ table.addEventListener('change', function (e) {
           if (!currentRunId) { alert('Select a run first.'); return; }
           if (atlStatus) atlStatus.textContent = '';
           renderAtlRows([]);
+          // Show the existing Run Checks popup first, then switch to the Autotask popup.
+          // This prevents the main popup from breaking due to stacked modal backdrops.
+          if (mainModal) {
+            reopenMainAfterLinkModal = true;
+            mainModal.hide();
+          }
           if (linkModal) linkModal.show();
           loadExistingTickets();
         });
diff --git a/docs/changelog.md b/docs/changelog.md
index a075402..94a0181 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -434,6 +434,16 @@ Changes:
 - Improved internal ticket resolve handling:
   - Do not overwrite resolved_origin when already set; keep “psa” origin when resolved by PSA.
   
+## v20260120-09-runchecks-modal-sequence-fix
+
+- Fixed Run Checks popup behavior by preventing stacked Bootstrap modals.
+- Restored correct modal sequence:
+  - The standard Run Checks modal opens first as before.
+  - The Autotask popup is opened only after explicitly selecting an Autotask action.
+- Ensured the Run Checks modal is temporarily hidden when the Autotask popup opens.
+- Automatically reopens the Run Checks modal when the Autotask popup is closed.
+- Prevented broken backdrops, focus loss, and non-responsive popups caused by multiple active modals.
+
 ***
 
 ## v0.1.21