Odd caps key malfunction

All of a sudden the left hand 'caps' key on my MacBook refuses to convert the top qwerty line of my keyboard in to caps, apart from the last letter P! It is fine on the others two lines. The right hand one works fine as does the caps lock. So using the left key, which is the most convenient, I get:
qwertyuioP
Do you think this is a problem with my laptop or have I pressed a wrong key somewhere?

Do check your preferences. Can you press shift and then the keys?

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