Why did my plant turn out like this???

Its an Alien OG Kush clone I got from the dispensary. I vegged it for about two days and then put it into flower. I harvested last night after it flowered for about 70 or so days.. why did it come out so puny? I never had any problems with leaves dying or curling. Why didnt it grow into one big cola or something???

UUUhhhh I do not know... Stumped me.. It looked like a half lb plant to me

Not enough light.

thats kinda wat i was figuring