Some hairs grow more out to the side while others grow straight down. So, one side of your beard may appear shorter than the other simply because the hairs on one side of your face are growing in an outward direction, while the hairs on the other side are growing downward.

Why do my sideburns grow unevenly?

Uneven beard growth is due to issues like genetics, stress, lack of proper diet and exercise. When these things are not taken into consideration, chances of the sketchy beard are higher.

Why does hair on one side grow faster?

Hair can actually grow faster on one side. Each hair follicle has its own blood supply, and it's possible that one side of the head has better circulation. Better circulation means faster hair growth.