Question on throttle behaviour with the 777

Hi, 

I am using a Precision Flight Control Cirrus II console with a 2 jet quadrant, so I have the Thrust reversers configure on a separate axis. The reverser works find. But when I have the 777 ready to taxi (Engine running) sometime when I increase the power both engines goes into reverse mode, and if I retract my Throttles to idle, a strange thing happens. Both engine goes in reverse mode and the two little white arms over the throttles retract inwards. Also my spoiler gets deployed and my takeoff speed gets deleted in the FMC, So to get the engine out of reverse mode, I have to use the mouse and push the two white arms toward the flight deck. 

Is this normal? or I am doing something wrong.

Thanks for the help

Pierre