ahh, there is absolutely nothing wrong with your plant.. Your plant is just in a very fast growth stage, to take in as much light as possible. Also, what dosn't help much is using the HPS (or a red spectrum light) during the veg phase(thats what im assuming your in right now). Hps will make the stems grow, and it will stretch quite a bit. To be more compact, you need MH, or blue spectrum light. If you would put a blue spectrum light in there it shoud grow taller and less bushy, the shape will take form. i'm guessing if you leave it grow a bit, the plant should fill out into its normal shape.. If it dosn't then you will have some very thick compact buds. Plant looking really healthy, good job with the growing. Keep at it bud!