Try shutting both tanks off and disconnect hoses . Open ans close all stove valves. Hook all back up and turn on one valve, that the selector is pointing to , slowly. Then try lighting . May be the selector switch is stuck or something.
It was a rainy few days at Algonquin Prov park...tarps kept us dry.
Wayne --Belle River (Windsor), Ontario
2013 Sunset Trail Reserve 25RB..
2015 White Chev Silverado 2500HD 4x4 (6.0 l gasser)
2003 Mountain Star 890SBRX Truck Camper