I'm Confused

We are carrying on with the book bag program. Everyday the teacher askes Sienna to take home a book to read at the bed time. She is doing amazingly well with it. I have a complaint about this series of books. This is what some parts read in today’s book "Meg":

"It is sad. It sat on a log. It ran up to a dog. The dog ran." Isn’t it confusing to put "sad" and "sat" together? And on top of it, the "log" and the "dog". As you read on, you know IT is in fact a hen called Meg. "Meg is rid of the mud. Meg is a wet hen. Dad set Meg in the hen pen." The hen is in the hen pen? Could it get more confusing? I don’t know much about teaching a 4-year-old kid. And not that Sienna is obviously confused. But speaking about common sense, is this the right time to play this game of confusion?

Somebody must enlighten me. I am confused.