Its a mutation. Doesn't really change anything.
"Another weird cannabis mutation which always dazzles the home grower is the formation of leaf buds. These often form at the base of the leaf, where the leaf and its stalk meet. It’s a fascinating change from buds forming on the main blooms. However, the cannabis leaf buds do little to enhance yield. Some growers remove leaf buds to allow leaf biochemistry to function along more normal lines. But plenty of other growers enjoy leaving them and showing them to their friends!"
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Here is a link if you want to learn about different cannabis mutations.
Cannabis seeds generally produce consistent, uniform offspring. But occasionally cannabis mutations can occur, here are the most common ones.
dutch-passion.com