I’ve had that spotting every one of my grows. Ones with nutes one without.... think it has to do with fox farm ocean potting if you do use that, that may be it. I’ve heard a lot of growers on here recommend flushing the soil a good few times before planting and ive never done that. And I’ve heard others speculate that was why, I believe they call it hot soil. Other than that speculation or possibility I’d recommend making sure your ph of your soil is alright because ph lockout can cause any deficiency to show. If the run off ph is fine and the container is large enough the roots are probably thriving and the soil was either too hot or lacking some kind of nute
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