Like others have said, this is due to its genetics and more importantly its Phenotype.
www.youtube.com/watch
Little you tube video about phenotype's and stuff.
As all seeds are not clones they are more or less brothers and sisters of each other, it the same reason why you look different then your parents/siblings.
Its nothing bad, just something to keep in mind, clones will be more suitable if your looking to prevent this.
Best Of Luck!
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