All that flashing square is showing is that you are reaching or have reached the limit of travel. In the case of the square under the wheel, it would show that you are lifting or have lifted the wheel off the ground.
It's not uncommon to lift a wheel off-road, it's not uncommon to have 2x wheels lifted either (cross-axled) but I would probably start to get twitchy if there were 4x flashing red bars under the wheels!!
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