Plant #3 (pic above) started as a sprout with disc...

It is a mutation called variegation (google it) , it's pretty common with cannabis and isn't harmful at all. It's just an aesthetic issues that doesn't affect the grow , the final product, the taste or the yield.

hey there, you do have mosaic virus (you can tell because the plants were affected since birth and it's spreading from plant to plant) , and there's nothing you can do, it's really hard to get rid of even for the next grows, basically nothing you can do short of bleaching your entire house, always be careful with the grow space and sanitation, reject plant gifts, and decontaminate regularly.... so sorry growmie ! hope this helps ! 🚀