Unknown illness

I think it's too much of everything for your auto. They take half the nutrients of a photo period & should be built up slowly to what the plant can tolerate. I would run just ph water through to a decent run off & check it is in the desired range You only need to add calmag once a week at most & at a much reduced rate. Goodluck

First make sure you fan isn't blowing directly on the effected leaves. It could be wind stress. Secondly it could be as others mentioned to much of one nute and not enough of the others. You just started flower. Make sure to keep giving veg nutes for another week or two. This will ensure they stretch good and will result in larger yields. After a couple weeks switch nutes to half and half veg and bloom. Then within a couple feedings completely go to bloom nutes. I also agree with other commenter, your plant looks like it may be receiving to much light. The nodes spacing is extremely tight. So turn down the power slightly. Check fans and where there pointed. Check nutes and switch if needed, and cut back light slightly. Hope this helped. Please select me as the answer so I can be entered for a chance to win grower of the month contest your support would be truly appreciated 🙏 😊