alright, so I need a little more help

As I approached at EDDH, I decided to do a visual, cause I might miss the localizer because of the problem above.
and so I turned off the autopilot and autothrottle to take command of the airplane.
But in this moment, enginepower turned to TOGA and I wasn´t able to put it back. I put the throttle on my jojstick to zero, but nothing happened, I´ve completely lost the control of my two engines.
Could anyone explain something like that?

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