Combine Filter can't remember

Using a combine filter for

(1 - Main Campus) Location:City
(2 - Remote Location) Location: City
(3 - Client Location) Location: City

Using major City as selection for perimeter cities and towns example

Grouped

+ Charlotte - Contains any word - Charlotte Gastonia
+ Raleigh - Contains any word - Raleigh Apex Garner
+ etc

When 'Remember' is checked produces error

Referrer: http://...?field_course_types_value=All&field_course_type_tid=All&field_select_industry_trainer_target_id=All&field_course_status_value=All&combine=2

Message: Illegal choice Raleigh in combine element.