Growing an Avocado from pit
I have grown Avocado trees from pits before, but this one has strange leaves.
There are several varieties of Avocado -- this must simply be a different cultivar than what you've grown in the past, or an Avocado that was the result of unintended cross-pollination, or the growing conditions are different enough that the plant is forming a bit differently. There shouldn't be any issue as long as the plant continues to grow, so have fun watching your Avocado experiment! This article may also help you: https://www.gardeningknowhow.com/edible/fruits/avocado/pollinating-avocado-trees.htm