I see two things with this picture and they are both related. You are showing a groundspeed of 429 kts.
One, I have no idea how you are going that fast with the increased drag of the gear being down.
Second, aircraft have a speed limit for gear operation. If you exceed that speed in a real aircraft a couple of things will happen. There may be a speed sensor that prevents you from operating the gear above the gear operating speed or the gear may not operate due to the force of the relative wind. You run the risk of damaging the gear if you exceed that speed.
Now, is any of that modeled in the sim? I have no idea, but try getting your gear up before you hit 200 kts and see what happens.