Leaves looking weird and discoloured

For your future grow, try to get some neem oil and do preventive spraying on vegetative stage once every 2 weeks on both side of leaves and branch, I swear it really helps.

its Leaf Septoria / Yellow Leaf Spot. Immediately (and carefully) remove all affected leaves to get rid of as many spores as possible. A copper-based fungicide or a broad spectrum fungicide may be effective at stopping the fungus from spreading though they are best used as a preventative. Depending on exactly what’s causing your leaf spot, Neem Oil may be used to help combat the problem. Hopefully, I answered your question and remember Happy Growing and Free your mind one puff at a time.