When using groups and clones, the label "for" attribute does not match the corresponding input's ID. This makes any site using Meta Box's group and/or clone features out of compliance with the Web Content Accessibility Guidelines for making sites accessible.
For example, inside a "rwmb-group-wrapper", a label might have a for="website" attribute, but the input that is supposed to correspond with that label will have an id="groupid_website" attribute. The label's "for" attribute needs to be exactly the same as the input's "id" in order for it to be WCAG and ADA compliant.