I am unable to save a contact with a that has 2 or more repeatable custom groups with a required custom field. The validation fails.
I am using CiviCrm 4.7.9. Has anyone else experienced this?
I've just tried this out on the demo sites (WordPress and Drupal) CiviCRM 5.5.alpha1 and its still not working. I'll look into reporting it as a bug, but I have found a partial work round (though this isn't what I want).
The problem only occurs with the custom field set using the inline option, so you could use tab or tab with table.