What is wrong with "Sono le tue scarpe bianche?" IT follows the same flow as the English sentence, as opposed to the given answer which translates to "Your shoes are white?"
It's not bad grammar, but it is a wording you'd probably never hear. Italian questions generally have the same word order as a normal statement.
Why is "le tue scarpe sono bianche?" Incorrect? That doesn't make sense. There should be two correct answers.
That should have been correct. Either you made a mistake you did not notice, or they made a booboo and it should be reported.
Why is "le scarpe tue sono bianche" not correct? I've just asked three Italians who confirm that the order doesn't matter!