I'm guessing root bound....my plant did the same thing, but your leaves got huge...I started mine very late july 28...but the buds i'll be gettin off mine will b e very nice...they are swelling like crazy and is still producing buds on the lower branches..I had mine in a small cup and when I went to transplant roots were pressed up against the sides of the cup everywhere and it was my first grow and I had a lot of fun....I mean isnt that what growing is all about? ....good luck with your grow and future grows