Well, not consistently wrong. Back in the 60s and 70s, they were mostly colored blue, but that’s because everybody’s eyes were colored blue at that point. It was the default color, especially because you were limited to only 64 colors total. Eventually, it changed, and Wanda’s eyes became consistently green, which is the color they’re meant to me. Everything else is a mistake–those happen sometimes, especially when the think in question is minor.