diff --git a/core/templates/core/log_attendance.html b/core/templates/core/log_attendance.html
index d8b9925..83b13b4 100644
--- a/core/templates/core/log_attendance.html
+++ b/core/templates/core/log_attendance.html
@@ -164,6 +164,13 @@
         if (teamSelect) {
             teamSelect.addEventListener('change', function() {
                 const teamId = this.value;
+                
+                // First, deselect ALL workers to clear previous selection
+                const allCheckboxes = document.querySelectorAll('input[name="workers"]');
+                allCheckboxes.forEach(cb => {
+                    cb.checked = false;
+                });
+
                 if (teamId && teamWorkersMap[teamId]) {
                     const workerIds = teamWorkersMap[teamId];
                     // Select workers belonging to the team
@@ -281,4 +288,4 @@
         form.submit();
     }
 </script>
-{% endblock %}
\ No newline at end of file
+{% endblock %}