Answer
Secession was a consequence of Mellismo within Carlism. Mellismo, a moderate faction within Carlism, advocated for collaboration with the Spanish government and a gradual transition to a constitutional monarchy. This stance alienated radical Carlists, who believed in a more confrontational approach to restoring the absolute monarchy. The resulting divisions led to a split within Carlism, with the secession of radical factions and the formation of independent Carlist groups.