got a problem.

ok so i'm making expressions and the like for a char, what i did was make subdiv half shapes, make eyebrows raise on each side, mirrors, makes work easier i guess..

convert them to poly, attach, delete history, channels, cleanup and then blend into the base shape. Now some shapes work as intended.. but others are giving me like a mess of polies. it's like some of the mesh is flipping faces and others are working somewhat ok. Does anyone know what causes this?