It looks light its stretching...
is it complete darkness when its lights out? Any sort of light (apart from green bulbs i think) will mess tings up..its all in the plants hormones etc.. It changes when the light is changed to 12/12, so having light during this dark cycle is no no..
You woudn't feel too happy if someone woke you in the night and shoved a light in your face would ya..
It may be either down to light at night, a last push of growth or it may be something to do with the fact that its growing up past the light... or is that just how the pic looks?
Although, saying all that, a couple of months ago i got hold of some big bang to smoke, it was pretty wet (as is most of the decent greenery around here, if its good its damp and if its s**t it dont matter cause whatever's sprayed on it
weighs it down like a biatch anyway..
)
anyway,
... it was pretty wet and cut too early, again as is most of the decent green round my way, thats why we keep saying, be patient, why spend all that love and time
into growing for months just to harvest before its ready??
Like killing a skinny pig to eat or someting..
F**k sake..getting back to the green!...On most of the big buds of the BB i got, the tops had the same thing your plant has but it seemed ok to me, if you leave it for a while anyway, it will probly gain abit more weight on those bits, probly cause he cut early and didn't let dem gain..
phew..we got there in the end..