diff --git a/core/themes/claro/claro.theme b/core/themes/claro/claro.theme
index b14f0bdfc1..338b192a60 100644
--- a/core/themes/claro/claro.theme
+++ b/core/themes/claro/claro.theme
@@ -996,7 +996,7 @@ function claro_preprocess_field_multiple_value_form(&$variables) {
     // Add an additional CSS class to the field label table cell. The table
     // header cell should always exist unless removed by contrib.
     // @see template_preprocess_field_multiple_value_form().
-    if (isset($variables['table']['#header'][0]['data']['#attributes']) && $variables['table']['#header'][0]['data']['#attributes'] instanceof Attribute) {
+    if (isset($variables['table']['#header'][0]['data']['#attributes']) && $variables['table']['#header'][0]['data']['#attributes']) {
       $variables['table']['#header'][0]['data']['#attributes']->removeClass('label');
       $variables['table']['#header'][0]['data']['#attributes']->addClass('form-item__label', 'form-item__label--multiple-value-form');
     }
diff --git a/core/themes/claro/css/components/form.css b/core/themes/claro/css/components/form.css
index 8e8c937d2d..4f4edd8ab5 100644
--- a/core/themes/claro/css/components/form.css
+++ b/core/themes/claro/css/components/form.css
@@ -49,15 +49,17 @@ tr .form-item,
   line-height: var(--line-height-form-label);
 }
 
+/* Multiple selectors used to ensure styling even if modules override markup. */
+
 .form-item__label--multiple-value-form,
 .field-multiple-table .field-label h4.label {
   display: inline-block;
   margin-top: 0;
   margin-bottom: 0;
+  vertical-align: middle;
   font-size: inherit;
   font-weight: inherit;
   line-height: inherit;
-  vertical-align: middle;
 }
 
 .form-item__label[for] {
diff --git a/core/themes/claro/css/components/form.pcss.css b/core/themes/claro/css/components/form.pcss.css
index a3f1a3bf15..6a5740636a 100644
--- a/core/themes/claro/css/components/form.pcss.css
+++ b/core/themes/claro/css/components/form.pcss.css
@@ -37,6 +37,7 @@ tr .form-item,
   font-weight: bold;
   line-height: var(--line-height-form-label);
 }
+/* Multiple selectors used to ensure styling even if modules override markup. */
 .form-item__label--multiple-value-form,
 .field-multiple-table .field-label h4.label {
   display: inline-block;