Update

resources/assets/dcat-admin/main.css

@@ -1890,7 +1890,7 @@ pre.dump {
     opacity: 0.7;
 }
 .checkbox-grid{
-    margin-top:2px;margin-bottom:0
+    margin-top:0;margin-bottom:0;top:1px
 }
 .checkbox-grid label{min-height:15px}
 .checkbox.checkbox-circle label::before {

src/Form/Field/Select.php

@@ -112,7 +112,7 @@ $(document).on('change', "{$this->getElementClassSelector()}", function () {
                 d.text = d.$textField;
                 return d;
             })
-        }).trigger('change');
+        }).val(target.attr('data-value')).trigger('change');
     });
 });
 JS;