Terry, for the same roof, two 1/12 common pitches and a plan angle of 135° measured between the eaves:

Jack Rafter Side Cut Angle = 22.42999°

O.K., I'm confused as well. I don't understand where the numbers on the Eagle square are coming from either. I thought they might be complementary to the angles generally defined as the side cut angles but that doesn't seem to be the case. Can you post a picture of the square?

PS: To summarize, Terry's assesment of the side cut angles is correct ... the framing square values posted for the side cut angles just don't add up. Does anyone else have an opinion or explanation?