Do you touch your leaves or spray them with anything.
If I touch my leaves I try to always wear gloves.
I noticed my last run some discoloration on some of my leaves like this. They had some dirt on them so I sprayed a little water and rubbed it of with my bare fingers. The next day those leaves looked like this. Our skin has natural oils and they rub of on the plant. I was told using Led lights to be careful with spraying anything oil based due to burn.