Input voltage: 12V.
RL=20 Ohms.
Q2:
Ve=11.67V
Vb=10.83V
Vc=11.58V
Q3:
Ve=11.66V
Vb=11.59V
Vc=10.30V
The voltages for Q2 look about right. 0.84V B-E voltage means it is being driven hard for its size which is expected.
Voltages for Q3 only make sense if the Vc and Ve are swapped? B-E voltage of 1.29V means that it's being stressed also.
Looks like output voltage setting is higher than what's available. Try decreasing the setting.
You need to get the proper transistors for it. Don't test at more than 500mA for now.
When it's happily regulating, the Base of Q1 should drop to a lower voltage and the CV op-amp's input voltages will be the same as each other.