UIView created during initWithFrame:frame won't disappear after removeFromSuperview

Question

This only occurs in iOS 4.3. There isn't a problem in iOS 5.

I've created a custom view. In initWithFrame:frame I'm creating several subviews and adding them to my view. Later, I try and remove those views:

for (UIView *v in self.subviews) {
    [v removeFromSuperview];
}

The subviews are removed. If I print out the contents of self.subviews, they no longer exist. However, they won't disappear. They continue to be visible.

Any thoughts or ideas?

Update

It appears that in iOS 4.3, subviews are being added twice. I'm going to do further investigation.