Il colore viola is masculine and invariable, la viola (feminine) is a flower or a musical instrument.

I did not use the wrong word. I used the wrong order.

i wrote porporo, why is it false ?

Ok, then, does that mean viola is the exact same, without its ending changing, for both masculine and feminine adjectives, both singular and plural?

I must have missed the lesson why they are switched

My word order is not the approved version, but just as valid.