I've been looking at this site and the Flat Earth theory in general for some time and  one question I'm never gotten a good answer to is:

If the Earth is flat, why does a lunar eclipse have a curve to it?
Edit: I'm actually not sure if it's called a lunar eclipse but I'm talking about the one where the moon has the shadow on it. I just saw one recently and at the very beginning it was clearly being covered in a round shadow.

Also, looking at the model on this site... How exactly would an eclipse happen anyways?

I'm truly interested so I'd love to hear any and all ideas!