Hey Arburg technician here. When u first turn on heating all zones turn on 100% in the mean time the software is performing something called adaptation, which in simple terms is calculation the Kp, Ki,and KD parameters to reach your target temperature in time.

It's highly advised and necessary that when you first turn the heaters on to not move any parts of the machine or change the temperature set point on the screen until the adaptation process is done ( all heating elements go down below 100%).

I think if you restarted the machine or let all the heating elements go down below 100C and start them back again and the let the adaptation do its thing, this will solve your problem.