I can only tell you MY experience... I ordered 6 seeds of one strain from a VERY reliable seed bank... one of the plants was just DIFFERENT... small, large leaves, didn't grow as fast (she only got to 21" and the other 5 were over 50"!!).... turned out it was not the same strain at all - wish I knew what strain it WAS because it was a beauty and I'd love to grow her again.. but there's no way to tell. I think this is what has happened to you... you just got an errant seed mixed up in your order and all you can do is grow her out, harvest her and enjoy her.... shit happens!
Good luck!