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 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.

John was going on a jungle trip. He asked his wife to pack something to eat, something to drink and something to burn if he feels cold in the jungle. When John opens the backpack he found just one thing in the bag. What was it?

I’m tall when I’m young, and I’m short when I’m old. What am I?

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

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

If an electric train is travelling south, then which way is the smoke going?

I know a nine-letter word having only one vowel.
Do you ?

John was piloting a plane behind a car but was never able to overtake it. Why?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?