In this case, I'll say that the people in question weren't acting out of character - with the possible exception of Ginny, and even she can be chalked up to hormones, growth, and being noticed.

But here's the thing. If you write something with inconsistent characters (is that a better phrase? Because it means about the same thing), and everybody calls you on it, it's wise to take that advice. That's why authors all have editors.