Is it normal for rabbits to eat their poop?

Absol;utely! Their dropping are almost entirely timothy hay, so it won't hurt them, and they do it in the wild as well. I would suggest joining a rabbit forum. Rabbit owners are usually very knowledgable and it's fun to chat with others that share the same love for the smart little guys. And I mean SMART! They totally don't get enough credit for their intelligence!