reset forms on site reload

src/pages/signup.astro

@@ -175,9 +175,12 @@ const signupDisabledSubMessage = signupSetting[SettingKey.SignupDisabledSubMessa
   // add click handler to open rules popup when clicking the rules link in the rules checkbox label
   rulesCheckboxRulesLink!.addEventListener('click', () => rulesPopupState.set('open'));
 
-  /* send signup */
+  /* ----- signup form ----- */
   const form = document.getElementById('signup')! as HTMLFormElement;
 
+  // reset form on site (re-)load
+  form.reset();
+
   async function sendSignup() {
     const { data, error } = await actions.signup.signup({
       firstname: form.firstname.value,