Can you spot what's wrong with the following sentence?

PETER WAS ANGRY AT
HIMSELF BECAUSE HE
ACCIDENTALLY LEFT THE
THE KEYS TO HIS CAR
AT HIS FRIEND'S HOUSE.

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

What jumps when it walks and sits when it stands?

How many times can you subtract the number 5 from 25?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

I am the fastest animal but cannot climb the tree. What am I?

What has to be broken before you can use it?

I am a type of food that is often found in the fridge and can be white in colour. What I am?
Hint 1: I am a dairy product.
Hint 2: You can spread me on the bread.

I make two people out of one. What am I?