Where did you get the seeds? Did you purchase a specific strain, or are they bagseed?

If bagseed, or from an obscure source...I could understand, as backyard 'breeders' are often a lazy bunch that don't generally back-cross to stabilize the strain, prior to selling their seeds.

Likely, if they are from the same source, the difference in characteristics is the difference between the male plant, and the female plant that the seeds came from. (perhaps one parent was a sativa dominate, and the other one was an indica dominate)

... just another wild guess :jointsmile: