회원가입 양식의 사용자 정의 필드에서 HTML 체크박스가 제대로 작동하지 않음

The problem remains in safe mode on Chrome for Linux.

This is my exact setup for the registration form concerning user fields:

  1. Confirmation/HTML checkbox
  2. Confirmation/HTML checkbox
  3. Dropdown (with 16 options)
  4. Confirmation/HTML checkbox