Monkey and Donny, you're the only two that don't understand so -

Is there the possibility that a ref can call a knockdown incorrectly? Yes.

Is there any examples of refs calling knockdowns incorrectly? Yes.

Is there the possibilty an incorrect call could have a bearing on a fight? Yes.

Does this affect the three-knockdown rule? Yes.

Does this show the three-knockdown rule is highly flawed? Yes.

The end.