Sleepless in Seattle的插曲里fundamental为啥发成funtamental呢？

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You must remember this
　　
　　A kiss is still a kiss,
　　
　　A sigh is just a sigh.
　　
　　The fundamental things apply,
　　
　　As time goes by
　　
　　And when two lovers “woo,
　　
　　They still say “I love you.“
　　
　　On that you can rely.
　　
　　No matter what the future brings
　　
　　As time goes by.
　　
　　Moonlight and love songs,
　　
　　Never out of date.
　　
　　Hearts full of passion,
　　
　　Jealousy and hate.
　　
　　Woman needs man,
　　
　　And man must have his mate.
　　
　　That no one can deny.
　　
　　It‘s still the same old story.
　　
　　A fight for love and glory.
　　
　　A case of do or die.
　　
　　The world will always welcome lovers
　　
　　As time goes by.
　　俺还查了下字典http://www.thefreedictionary.com/fundamental，都是发d而不是t呀。