Looks like leaves are being snacked on but no bugs?

Searched for a while with scope and magnifying glass but no signs of any bug.
What can do this to my leaves?
Thanks for any opinions!

Looks like inchworms

The plants are indoors and no bugs have been spotted, you would think the worms should be easily spotted. Also I forgot to add that it's only occurring on one plant

How about genetic anomaly? That is, if you can't find any other reason.

Thanks for the suggestions everyone

Maybe it's hiding in the soil and feeds during darkness? Only on 1 plant is odd but possible.

Do you have a cat? Mine gets me all of the time. (That evil little furball) Other than that it does look like bug damage. Look at the main stem and all along the branches. Especially the underside. They are green and blend in well when resting. Good luck!