Chemical Burn or Heat stress or something else

Sorry if this is a novice issue but I am having a hard time diagnosing this issue. 2 plants look good, 2 plants look bad. What am I doing wrong? Please see the pics and let me know if you can...DSC06418.jpgDSC06413.jpgDSC06420.jpgDSC06414.jpgDSC06419.jpgDSC06417.jpgDSC06416.jpgDSC06415.jpg
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Looks like chem burn, but u said its only on 2 of the 4 plants? Ur. Feeding them out the same nute mix. Right? I would. Try a lower ppm next time u feed,
 
Yeah, it is possible that I got some on the leaves the last time I watered them. They all receive the same mixture. I can pull back on the nutes as well. I am 1/2 right now, should I go to 1/4?
 
If you are spraying them(I see some spots) do it during the night cycle or it may magnify the light and burn your leaves.
 
agreed, only spray @ night, and what weeke are. U in, still in vegg? Or. Flower? This will determine what ur. Ppm should e
 
If I was u, I would. Start the flowering cycle soon, plant will double at thevery least in flower
 
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