I'm aware that most adjectives come after the noun they qualify, but certain adjectives usually come before the noun: bello, bravo, brutto, buono, caro, cattivo, giovane, grande, intero, lungo, nuovo, picolo, stesso, vecchio, vero. Some of these adjectives have different meanings when they are before or after the noun (eg "un grande uomo" = a great man, "un uomo grande" = a large/tall man).
I have recently read the following sentence in an Italian learning tool:
È una sana paura.
Why is "sana" before the noun in this sentence? Is it because the adjective has a figurative meaning? Would "è una paura sana" be wrong?