Puzzled

My plants have got these weird markings and I can't find anything on the internet to tell me what it is. Does anyone have any insight?

Anyone?

I only see 3 brown spots on one leaf. Are they everywhere or just on that one leaf?

Looks like you may have gotten some water on the leaf and it got burned by your light.

It's on 2 leaves and it's not liquid slashes

This site is fucking shit!