https://support.atlassian.com/jira/kb/multi-level-cascading-select-custom-field-disabled-option-still-visible-when-opening-a-ticket-on-customer-portal/
Multi-Level Cascading select custom field disabled option still visible when opening a ticket on...
Learn about the Multi-Level Cascading Select bug causing disabled options to appear in the Customer Portal and how to resolve it.
opening a ticketmultilevelcascadingselect