Caterpillars, moths, or gnats. You'll know when you see them. Check undersides of every leaf and keep an eye out for droppings. Doesn't look like ypu have more than a couple so thats good news.
Them lil guys are some bunch of drug addicts innit?
looks like some insect went and munched on your plant. you know... edibles.
better kill him if you find him.
Good luck and stay lit growmie.