I wouldn't worry, different seeds have different phenotypes and they're all different just like anything else in nature, that's why you hear of people phenotyping or phenohunting to get the best genetics possible and traits the desire, such as a plant that really bushy or has a lot of arms and that grows taller, faster and has a flavors they want....Just let them do their thing I just recently had a issue in my tent where the runt wasn't thriving and took a turn for the worse so I chopped her down to prevent pests and such...Good luck they look good so far....