spotty leaves

this is a blue shark cbd strain. as of recent these spots on the leaves have shown up. they are about 10-12 weeks old and are growing in a greenhouse with about 10 other plants.

the person I was kind of learning how to grow from is telling me that it's bud rot and that it'll self correct, but from what I've been reading, bud rot is due to a fungus and can spread to other plants. if that was the case, the other 10 plants would have issues.

any insight into this would be great!
 

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