Patches/ yellow spots

It’s a Calcium deficiency. You might be somewhere past middle flowering and less than 4 weeks from harvest. Control the EC level of the drain to make sure it isn’t too high. The absorption can be curbed by a high level of ammonium, potassium, magnesium and/or sodium in the root environment.

Looks like to much N , lay off the cal mag it's got N PRESENT and your In flower , your plant uses very little N during flowering so any added N at this point will pretty much keep being toxic. Don't add any N , grow nutes or calmag for at least 10 days the plant might need a few extra days as any sick days you don't count or overeating etc. Keep giving P-K

Both had calmag in case of low nuts but not fixed it and only on the one plant in same tent